Weihrauch HW77KSE spring air rifle

Weihrauch HW77K Air Rifle, Part 2.

Weihrauch HW77K Air Rifle, Part 2.

Weihrauch HW77K air rifle, part 2, will continue here with the second part of this series of 4 articles on the popular spring powered air rifle. Now I will discuss the HW77K in .20 calibre and other features that are common to the remaining 3 calibres.

The .20 calibre Weihrauch HW77K air rifle is not a common calibre imported into Australia due to the limited number of competition air rifle target shooters. We have a fledgeling competitive air rifle following at present in Australia (at the time of writing this) and so the demand for the .20 calibre so far in the HW77K air rifle is minimal.

I carry the .20 calibre HW77K in Blue and Stainless in limited numbers as they were specially ordered and had to be flown in from Germany after a protracted wait of many months.

The .20 Calibre Weihrauch HW77K air rifle.

This particular air gun makes a great target rifle due to the flat trajectory of the .20 calibre pellet’s flight path and as it is a slightly heavier pellet than the .177 making it pretty stable. It has a limited but vocal following of air gunners who insist that the HW77K air rifle in .20 calibre makes a better and more accurate shooting rifle than the very popular HW77K in .177 calibre.

Not being a user of the HW77K in .20 calibre I can’t really comment on this one way or another, but I will say this, and that is the .20 calibre HW77K air rifles I have tested here shoot very well indeed. I also think that if there was a larger range of pellet types for the .20 as it is for the .177 then it could well live up to the claims of its followers.

So if you want an air rifle that is in-between .177 and .22 and that has a flat trajectory, accuracy and obviously an energy level midway between these two calibres, I suggest that you take a good look at the .20 calibre HW77K air rifle. The features, accessories and support that are available for the .177 and .22 calibre HW77Ks are still the same: basically the same rifle just a different barrel.

Those of you who already shoot the Weihrauch HW77K in .20, if you have anything to add on the positives (or negatives) of this air rifle that I don’t cover within these four articles, then please email me and I will share it with everyone.

The .20 Calibre HW77K air rifle straight out of the box.

As with all new spring powered air rifles, whatever the brand, they take quite a few shots before they start shooting that well. The first 100 shots are usually the worst while the seal beds in and the spring develops a ‘set’ and then with the barrel slightly leading up.

Furthermore, it is not just the air rifle that improves with time, it is you the shooter as you develop muscle memory and familiarity with the gun.

The graph below shows all four calibres of Weihrauch HW77K firing the first 15 shots out of the box and then some 50 shots later, another 15 shots. You will see that the Extreme Spread has reduced along with the speed to a small degree, while grouping also improved. The tests were done using the H&N Baracuda in each calibre of the HW77K air rifles tested. This clearly demonstrates that as the HW77K air rifles put through more pellets they settle down and with a reduced spread, the consistency will help you with grouping.

The speeds below are not set in stone so to speak, they are individual speed results and what you see here may vary quite a bit from what you may experience yourself with a HW77K air rifle.

Weihrauch HW77K Spread sheet Results

HW77K .20 Cal Spread sheet

Weihrauch HW77K Energy Graph

HW77K Energy Graph for a .20 Cal

Graph for HW77K showing Extreme Spread

Extreme Spread Graph for a .20 HW77K

HW77K Speed Gunroom Graph

Average Speed Graph for a HW77K in .20 Cal

Should you Tune your HW77k air rifle or not?

In my opinion, yes. Weihrauch HW77K air rifles are mass produced and while the machining specifications are unparalleled, variances do exist in spring technology, compression pressures, tolerances and bore finishes. In saying that, I haven’t come across a HW77K or any other air rifle that I have tuned that didn’t benefit from a Vortek Tuning Kit.

I’m guessing if you just throw a Vortek Tuning kit into a HW77K air rifle without doing the prep work and then shimming ‘up and down’ against speed and grouping results, then the benefits may be marginal. As for speed, detuning the .177 and .20 from FAC down to 12 ft. lbs. or less generally gives better results as the recoil is reduced and with the better Vortek spring and guide, more consistent speeds are obtained.

I sell the Vortek kits and can talk you through fitting them if that is the way you want to go, or if you are buying a new HW77K air gun or similar Weihrauch spring air rifle, I can tune it for you. If you already have a HW77K, HW77, HW97K or HW30, 50, 80 or 95 and you want it kitted out, just send me the action and leave the stock at home, but PLEASE call me first to see that I have time to do it.

Weihrauch HW77KT Air Rifle

Weihrauch HW77KT in Stainless

As for results, I have fitted kits in .177 and .20 HW77K and HW97K air rifles that have reduced the group of 42mm and 18mm respectively at 25 metres, down to 6mm groups. The .177 suffers from hot loads and the .20 does also to a degree. By detuning your FAC air rifle down to 12 ft. lbs. you won’t shed that much speed that it is screamingly obvious, only you will have an air rifle that is comfortable to shoot and also performs with better placement, which is more important than speed.

Weihrauch HW77K air rifle Summary.

I haven’t covered dimensions, weights or options for the Weihrauch HW77K in .20 calibre yet, but as all the ‘77Ks are basically the same, I shall cover these issues over the next 2 articles.

So to generalise the .20 calibre, I would say this: if you are going to get involved with target shooting then give the Weihrauch HW77K in .20 calibre a good look, however, if you are a hunter then maybe look at the .22 calibre air rifle if you want to shoot larger vermin like rabbits.

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