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Brocock Compatto Low Power Mode Review.

Hi once again Guys, I have finally got around to finishing the 3rd part of this Brocock Compatto review on their  .22 calibre semi-bullpup. If you have followed along from part 1 to here then you will know that I am now putting up the results of testing the Compatto in Low Power mode.

It may be prudent to remind you that the gun used in this review was straight out of the box with no adjustments, modifications or accessorising in any way. The following are groups shot in each mode, with High Power on the left, Medium Power in the centre and Low Power on the right. This will save you the problem of scrolling back through the 1st and 2nd articles looking for a comparison. There is also a graph further into this article giving you a visual perspective of the 3 modes, their speeds in f.p.s. and Standard Deviations.

Brocock Compatto Side View

The Brocock Compatto Right Hand View showing the Power Level Knob on High in this Image.

The Compatto Review Targets side by side.

H&N Baracuda Pellets are our testing pellets by choice as they are available in the 4 main calibres and generally speaking, provide a good all-round baseline for comparisons with other pellets. Those of you new to my articles and air rifle testing procedures please note that I do not normally adjust the scope or POA when moving from one pellet type to another or one target to another, that is the point of having a baseline.

I also try and shoot a complete test in one day as large variances in weather can throw out your results: this can be seen in the 1st article where I had to alter the scope on the 10 Shot Pellet Decay Test following a low group on the 1st target shot on the 2nd day. Academic in this case as I maintained my POA for the following 4 Targets when I could have run with all 5 groups low but still tight. With time being tight I did it this way that in hindsight may not have been the best choice as it does demonstrate the effects of weather from one day to the next. The wind during most of these test shoots was blowing from Left to Right and the impact of that can be seen in the results. All testing was done using a MTC Viper Pro 5-30×50 Scope.

H&N Baracuda.

21.14 Gr x 5.50mm.

Power Levels                         High                           Medium                     Low

Standard Deviation               (2.7)                            (5.2)                            1.7 Ft

Highest Speed                        (751.5)                       (716.6)                         661.8 F/S

Lowest Speed                         (743.8)                       (702.4)                        656.6 F/S

Extreme Spread                     (7.6)                            (14.1)                           5.1 Ft

Average Speed                       (747.9)                       (708.2)                        659.2 F/S

Energy                                     (26.26)                       (23.55)                        20.40 Fpe

 

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JSB Exact Jumbo Heavy.

18.13 Gr x 5.52mm.

Power Levels                         High                           Medium                     Low

Standard Deviation               (3.8)                            (3.6)                            2.0 Ft

Highest Speed                        (806.5)                       (776.5)                        711.4 F/S

Lowest Speed                         (794.5)                       (765.7)                         705.4 F/S

Extreme Spread                    (11.9)                          (10.7)                            5.9 Ft

Average Speed                       (800.5)                       (773.5)                         708.5 F/S

Energy                                     (25.80)                       (24.09)                        20.21 Fpe

 

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H&N Terminator.

16.36 Gr x 5.50mm.

Power Levels                         High                           Medium                     Low

Standard Deviation               (11.8)                          (10.7)                          3.5 Ft

Highest Speed                        (807.6)                       (760.8)                       711.8 F/S

Lowest Speed                         (773.6)                       (729.5)                       703.1 F/S

Extreme Spread                     (33.9)                          (31.3)                          8.7 Ft

Average Speed                        (794.0)                       (745.3)                       708.3 F/S

Energy                                      (22.91)                       (20.18)                         18.23 Fpe

 

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H&N Field Target Trophy.

14.66 Gr x 5.53mm.

Power Levels                         High                           Medium                     Low

Standard Deviation               (9.4)                            (8.5)                            4.4 Ft

Highest Speed                        (870.3)                       (803.2)                       759.2 F/S

Lowest Speed                          (844.2)                       (779.9)                       745.4 F/S

Extreme Spread                     (26.1)                          (23.3)                          13.8 Ft

Average Speed                        (859.3)                       (788.5)                       754.0 F/S

Energy                                      (24.04)                       (20.24)                       18.51 Fpe

 

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H&N Baracuda Power.

H&N Baracuda Power

21.14 Gr x 5.50mm.

Power Levels                         High                           Medium                     Low

Standard Deviation               (6.8)                            (8.5)                            Fail Ft

Highest Speed                        (870.3)                       (803.2)                       Fail F/S

Lowest Speed                         (844.2)                       (779.9)                       Fail F/S

Extreme Spread                     (26.1)                          (23.3)                          Fail Ft

Average Speed                       (859.3)                       (788.5)                       Fail F/S

Energy                                     (24.04)                       (20.24)                       Fail Fpe

 

I would NOT recommend H&N Baracuda Power for use on LOW Power in the Brocock Compatto. They are a copper coated pellet and the manufacturer’s recommendations are a minimum power level of 12 Fpe (16 Joules). However, when we tested them in the Compatto we got very erratic results that stopped our testing in Low Power before we really got started.

 

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JSB Exact Jumbo.

JSB Exact Jumbo

15.90 Gr x 5.52mm.

Power Levels                         High                           Medium                     Low

Standard Deviation               (3.3)                            (6.3)                            5.2 Ft

Highest Speed                        (843.1)                       (794.4)                       728.8 F/S

Lowest Speed                         (834.2)                       (773.6)                       712.9 F/S

Extreme Spread                     (8.9)                            (20.7)                        15.8 Ft

Average Speed                       (837.7)                       (784.7)                        723.4 F/S

Energy                                     (24.78)                       (21.75)                         18.48 Fpe

 

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H&N Baracuda Hunter.

H&N Baracuda Hunter

18.21 Gr x 5.50mm.

Power Levels                         High                           Medium                     Low

Standard Deviation               (4.6)                            (5.2)                            8.0 Ft

Highest Speed                        (797.8)                       (769.4)                        660.9 F/S

Lowest Speed                          (784.7)                       (754.2)                       635.7 F/S

Extreme Spread                     (13.2)                          (15.2)                           25.2 Ft

Average Speed                       (790.8)                       (760.5)                       651.1 F/S

Energy                                     (25.29)                       (23.39)                        17.15 Fpe

 

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H&N Hornet.

H&N Hornet

16.00 Gr x 5.50mm.

Power Levels                         High                           Medium                     Low

Standard Deviation               (7.0)                            (6.3)                            1.3 Ft

Highest Speed                        (830.6)                       (785.9)                       725.8 F/S

Lowest Speed                         (811.5)                       (768.4)                        721.8 F/S

Extreme Spread                     (19.1)                          (17.5)                           4.0 Ft

Average Speed                       (822)                          (773.2)                       724.1 F/S

Energy                                     (24.01)                       (21.15)                         18.63 Fpe

 

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H&N Hunter Extreme.

H&N Hunter Extreme

19.09 Gr x 5.50mm.

Power Levels                         High                           Medium                     Low

Standard Deviation               (7.6)                            (10.9)                           2.1 Ft

Highest Speed                        (802.5)                       (706.0)                       685.6 F/S

Lowest Speed                         (780.5)                       (676.2)                       679.3 F/S

Extreme Spread                     (21.9)                          (29.7)                          6.2 Ft

Average Speed                       (793.2)                       (692.2)                       682.6 F/S

Energy                                     (26.68)                       (20.32)                       19.76 Fpe

 

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JSB Ultra Shock Heavy.

JSB Ultra Shock Heavy

25.4 Gr x 5.52mm.

Power Levels                         High                           Medium                     Low

Standard Deviation               (4.1)                            (4.5)                            3.8 Ft

Highest Speed                        (657)                          (640.4)                       570.9 F/S

Lowest Speed                         (646.3)                       (628.1)                       559.2 F/S

Extreme Spread                     (10.7)                          (12.2)                          11.6 Ft

Average Speed                       (651.9)                       (634.1)                        566.4 F/S

Energy                                     (23.97)                       (22.68)                       18.10 Fpe

 

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JSB Exact Jumbo Monster.

JSB Exact Jumbo Monster

25.4 Gr x 5.52mm.

Power Levels                         High                           Medium                     Low

Standard Deviation               (3.5)                            (2.9)                            Fail Ft

Highest Speed                        (670.6)                       (659.2)                       Fail F/S

Lowest Speed                         (662.5)                       (650.5)                       Fail F/S

Extreme Spread                     (8.0)                            (8.6)                           Fail Ft

Average Speed                       (666.3)                       (652.9)                       Fail F/S

Energy                                     (25.05)                       (24.05)                        Fail Fpe

 

The JSB Exact Jumbo Monster while being the same size and weight (but not shape) as the JSB Ultra Shock Heavy just did not perform as the target testifies on low power. Remember, this is but ONE rifle straight out of the box, no barrel leading or beading in, no modifications or tuning and operating on 200 Bar and not the 240 Bar that Brocock now recommends for FAC Compattos.

I used 200 Bar in this 4 part article as most of the filling systems that rely on Scuba bottles have the 232 Bar K valve that will only refill a 200 Bar rifle a few times and will not manage the 240 Bar limit. That said, I will be doing a test using 240 Bar as the recommended pressure and be comparing it with these results. This will allow you guys who are sitting on the fence so to speak, to make up your minds whether or not it is worth forking out the extra money for a 300 Bar Scuba bottle for the extra performance that it will give you.

If I were to test the Compattos on 240 Bar then many of you would cry ‘foul’ as I may have sold you a 232 Bar unit. At least this way with 200 Bar filling stations you can obtain accurate information and those of you who have budgeted for 300 Bar systems will soon get the chronographed results that you can expect from a 240 Bar fill.

 

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H&N Baracuda Green.

H&N Baracuda Green

12.35 Gr x 5.50mm.

Power Levels                         High                           Medium                     Low

Standard Deviation               (7.2)                            (2.9)                            6.2 Ft

Highest Speed                        (916.3)                       (876.6)                       780.8 F/S

Lowest Speed                         (897.2)                       (868.1)                       763.7 F/S

Extreme Spread                     (19.1)                          (8.5)                            17.0 Ft

Average Speed                       (904.55)                     (872.3)                       770.9 F/S

Energy                                     (22.44)                       (20.87)                        16.30 Fpe

 

This H&N Baracuda Green Pellet is one of the lightest pellets in .22 calibre that I stock and as of now, has a very limited following. When looking at the targets you will notice that these pellets shoot a bit high at 25 metres yet group pretty well out of the box.

Those of you into tuning, I will be testing the Huma Regulator in a Compatto in the coming week and I am sure that this pellet will excel itself in accuracy and shot count. Those of you into target work, I think that should you weigh, sort, inspect and divide weights of these pellets, then try them lubed and un-lubed, you may well be on a winning combination in my view. I am working on an article (multi-part) on Pellet Selection for Tuning.

 

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Brocock Compatto Low Power Pellet Decay Test.

 

 

 

 

 

 

 

 

 

 

Standard Deviation               2.2 Ft                                                  2.9 Ft

Highest Speed                        707.2 F/S                                           703.3 F/S

Lowest Speed                         698.3 F/S                                           693.9 F/S

Extreme Spread                     8.8 Ft                                                  9.4 Ft

Average Speed                        702.4 F/S                                          699.5 F/S

Energy                                      19.87 Fpe                                           19.70 Fpe

 

The LEFT target shows the first 10 shots from a 200 Bar fill and the target on the RIGHT shows shots 11-20 as we do the Pellet Decay Test here. The vertical and horizontal lines going through the Bull are used with the reticle cross hairs as finding the Bull after numerous shots becomes difficult when the Bull is obliterated.

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Standard Deviation               7.4 Ft                                                  9.5 Ft

Highest Speed                        696.1 F/S                                           681.5 F/S

Lowest Speed                         675.5 F/S                                           652.3 F/S

Extreme Spread                     20.5 Ft                                                29.2 Ft

Average Speed                       687.0 F/S                                           666.6 F/S

Energy                                     19.00 Fpe                                           17.89 Fpe

 

The LEFT target above shows shots 21-30 while the RIGHT target shows sots 31-40. As can be seen from the targets the groups are not that bad for low power considering that one would use this power mode for close up vermin control or just plinking. Whatever, this is LOW power that is not necessarily used when competition shooting though one could do with some selective tuning and practise in this mode.

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Pellet Decay Test.

Shots 41-50 in this last target shows a reasonable group but it has passed the Decay point and so finishes the Pellet Decay Test.

 

The Pellet Decay Test is a testing sequence where either I or Peter shoot a full air fill (only 200 Bar in this case) using the best performing pellet until the group drops 3 or more pellets out of the RED circle. This Decay Test is not an accepted air rifle test, it is a test that we felt demonstrated the usable shot placement that one could expect to get from a full fill.

I use only 10 shots per target so one can see the gradual decline in either the group or the pellet drop as the cylinder pressure drops.

When analysing Chronograph results I feel that not enough emphasis is put on the Standard Deviation / Extreme Spread. The Standard Deviation is a formula derived to show the mean average between each shot. I will cover this in an article on Pellet Tuning that I am currently writing. What IS IMPORTANT is the Extreme Spread as this tells you the separation distance between the fastest pellet and the slowest pellet.

Those of you new to this, if you measured the distance that the slowest and fastest pellets had travelled, you would find in this case on the right here, that the fastest pellet had in fact travelled 38.7 feet further in 1 second that the slowest pellet.

Standard Deviation               12.4 Ft

Highest Speed                        658.5 F/S

Lowest Speed                         619.8 F/S

Extreme Spread                     38.7 Ft

Average Speed                       637.1 F/S

Energy                                     16.34 Fpe

 

Note that the average energy is 16.34 Foot Pounds (Fpe) and that equates to the power of many spring powered air rifles. The power and accuracy compare favourably with the Weihrauch HW100TK at a cost of about 25% less.

 

 

 

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The Brocock Compatto in .22 calibre with a Sling Shot Hammer fired in all 3 Modes: High in Green, Medium in Blue and Low Power in Red. This is an image that can be copied and zoomed if required.

As can be seen from the Graph image above, as the air pressure drops, so does the consistency of pellets while achieving close to the same feet per second. The ideal pellet will have a minimal Standard Deviation (SD) of less than 2.5 as that works quite well. On one occasion we have seen an SD of 0.0 with an Extreme Spread of 8” here over 10 shots. Effectively the pellets are travelling at the same speed with all 10 shots travelling very close to the same distance in 1 second. While very rare, having seen it I know it can be achieved with certain rifles if you put in the due diligence that is required when tuning.

Compatto Shot Count.

In a Brocock Compatto, any increase in power comes at a high cost in shot count as the cylinder is only 150cc. To achieve this shot count the Brocock is fitted with an Inertia Hammer, aka Sling Shot Hammer that is not only effective as a hammer but it also regulates the firing air charge efficiently.

In my view, an accurate PCP air rifle is a better choice than a more powerful rifle that lacks accuracy. In hunting I put accuracy above power and that is where you guys need to be going with your guns. Tune them so that they are accurate, then armed with this knowledge that you can hit what you are aiming at you can go hunting with effect.

You guys that are into vermin control I would seriously suggest that you take a good look at a Brocock Compatto with its selectable power range. With vermin control you have to be setup for multiple shooting environments, from open paddocks, bush, around houses and in warehouse and sheds. This fluid shooting environment requires different pellets as well as different power settings, hence the Brocock Compatto. With the Compattos’ short overall length, ladder frame stock of polymer construction you have a working tool of considerable durability and ease of handling.

If you are not into hunting, then a look at the targets from High Power down to Medium Power and that will show you that this Compatto PCP air rifle has the DNA required to be used competitively. With the adjustable power you also have the ability to practise in a confined place or just plink without going through copious amounts of air or putting holes in shed walls etc. The Brocock Compatto is available in .177, .22 and .25 calibres and as can be seen from the tests it is fairly pellet consistent and will benefit from tuning and correct pellet management and selection.

Author: Ian McIntosh

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