So where are all the HW57's hiding ??

[TonyL]

I sold mine, which was a .177 with the metal pop up loading tap.
Did a lot of experimenting with seals, piston weights and springs, but the gun was a slammy mess when pushed above 8fpe.
Accuracy was ok but never really good.

In the end I fit a somewhat reduced spring that gave it a more pleasant shotcycle, a fresh seal and fitted guides, and sold if off cheaply with clear info that it had been soft-tuned.

Pretty much my experience with my .177 57. Bought it from Germany back in 2019, it was running at 6ftlbs due to the German market mainspring. Re sprung it with a cut down 97 spring, big mistake, 13ftlbs and awful to shoot, after a chop and coil collapse, now running at 9ftlb. Still not as accurate as i'd like. I think the longish stroke and light weight go against it.

So, guessing that these may be similar internally to a 99? So 26mm bore. Anyone know the stroke and TP diameter and length?

I'm guessing that the pellet will not be a snug fit into the loading "gate", reducing the SCR massively as the pellet has to jump from gate and it will be a looser fit than a pellet which has snugly clicked into the rifling. After this very easy first stage of its journey it then has to engage breech and rifling, without that helpful thumb / finger of humankind assistance? So, guessing that this will magnify the slammy effect, but might it also then see a spike in pressure as the pellet engages breech, promoting extra piston bounce?

Having said all that, although not desperate to own one, I could actually see myself rehoming one one day.

[evert]

So, guessing that these may be similar internally to a 99? So 26mm bore. Anyone know the stroke and TP diameter and length?

Yes, 26mm and very similar to the 99/50s. Unfortunately I never measured the stroke.
I belive the big issue is that the pellet skirt is sized down in the tap. At least my rifle had a breech taper in the tap, much like your average breech taper in a modern HW rifle, so the skirt seals on that. But the skirt will be sized down when it moved through the tap, so you will not have a great fit in the barrel, plus there is a taper/leade in the barrel where the pellet will be loose, so there will be some air leakage around the pellet. The skirt will never be sized to the barrel like in a rifle where you lad directly into the barrel.

Reading peoples experience with the 57, it seems like the .22 might be more forgiving than the .177?

[TonyL]

Thank you for that, evert. Most enlightening.

[Longbowlarry]

I've had them in both cals and was very disappointed in both to be honest. The breeches are very pellet fussy and
Lots of jams. And very inaccurate. I've tried different ones and used lads at the clubs and they say the same, the must be some good ones surly but they are not a true hw springer

[robs5230]

So, guessing that these may be similar internally to a 99? So 26mm bore. Anyone know the stroke and TP diameter and length?

I'm guessing that the pellet will not be a snug fit into the loading "gate", reducing the SCR massively as the pellet has to jump from gate and it will be a looser fit than a pellet which has snugly clicked into the rifling. After this very easy first stage of its journey it then has to engage breech and rifling, without that helpful thumb / finger of humankind assistance? So, guessing that this will magnify the slammy effect, but might it also then see a spike in pressure as the pellet engages breech, promoting extra piston bounce?

Having said all that, although not desperate to own one, I could actually see myself rehoming one one day.

26mm bore
81mm stroke
3mm dia TP and I think 18mm tp length

[TonyL]

26mm bore
81mm stroke
3mm dia TP and I think 18mm tp length

Thanks, Rob.

[venoman]

Not a very popular rifle same internals as the 99s but the 99s is a much better gun.

[Black Beard]

I did a bit of examination on the end of a .22 HW57 barrel. Under the foresight is a 15mm long section, 8mm from the end of the barrel that has grooves rolled into it. These don't appear to make any difference to the inside of the barrel. Inside the barrel is a 5.7mm counterbore for about 8mm and I can't feel any choke. There is the potential that the pellet, which will be sized to 5.5mm, will have air trying to force its way past the corners of the skirt just before it exits the barrel. This isn't going to be good for accuracy as any inperfection in the skirt is going to cause a wobble.

I think HW could improve the barrel by using a choked one and either increasing the counterbore diameter or removing it all together. This might make them shoot better.

BB

[TonyL]

Hmmm, sounds most unsatisfactory and odd? As has been said before, a choked barrel may or may not be better than an unchoked one in many cases. But if we're talking barrels with tighter spots earlier in the barrel, a choke has to be a good thing? But this arrangement sounds bizarre and would surely benefit from some strangling!

[Black Beard]

I agree Tony. The 57 has the potential to modify the pellet as it jumps from the loading port into the barrel so a choke is a good idea.