HW100KT seems inconsistent

[mattup]

Good evening all,

I hope you have enjoyed the weekend.

I managed to have an hour in the garden with my new rifle having set up my FX chronograph.
I am a little concerned with the result, see below. The rifle was filled to 200bar and this was the second magazine through it. I left around 10 seconds in-between shots. Comments please.

Shot count: 14
Low: 768
Hi: 803
Avg: 789
Spread: 35
STD Dev: 10.6
777
784
782
782
782
803
786
800
796
768
800
800
798
789


Many thanks

Matt

[tinbum]

Try different pellets. I did a test with an HW80, best variation was 3.5 fps, worst 17 fps.

[CannonFodder]

I'd say pellets too, I use Weihrauch F&T Specials.

[rapidresponse1]

as above different pellets

[mattup]

Thanks Gents.

I have been using 4.51 pellets (air arms and JSB).
I have ordered a few different 4.52 and 4.53 tins to try.
Will report back.

Regards

Matt

[Jesim1]

If your looking for consistent result you have to actually weight the pellets which will probably half your deviation. Pellets out the tin are fine for checking it's legal, but for meaningful results they vary too much to be of anything other than a guide. Try weighing a mags worth and compare it to what you have done, other pellets or batches will also give different results, but once you have done this you will legitimately know if your guns in need of a service and the reg adjusted.

I've just done a quick calculation - with your figures and pellets you say your using your running too close to the limit, and at 803fps/8.4gn your over it. if that single pellet was 8.7gm you would be doing 12.45fpe, and if it was only 8.1gn then you would be at a healthy 11.6fpe - so you can see how big a difference it makes in your situation as you may need this turned down a bit