Thanks guys, some interesting thoughts there and leaving the internals alone is probably good advice!

Regarding my measurements, my Crony was hooked to my laptop, so I was rattling through the mags fairly quickly.


So given that I'm unlikely to improve the pellet velocity spread, is there anything else I should be looking at on the gun to improve grouping at longer ranges? (50 to 100M)

The new barrel shoots most pellets well, but the usual suspects group marginally better (AA/JSB).

I get 14 shot groups of 25mm at 50M, 50mm at 75M and 75mm at 100M.

This might just be as good as it gets with an HW100 of course! I know it can be an awful lot worse... it was with the original barrel...