BSA Standard .177 (short cylinder)... power levels and accuracy.

[Shed tuner]

Just gotten hold of one of these (thanks Jamie)...

Twanged like a Gamo, so I resprung it with a cut down TX Mk3 spring (thin wire, weak) which is a nice fit in the piston, and sleeved up the guide with some ally tube so now it's a nice fit. Shoots well, no twang at all, quick but not harsh, and just under 6FP.
It's running a leather seal, which seems to be in OK condition, and the fit is good. I could graft a new parachute seal on to give me a few mm more stroke, but I'd rather keep it original (unless I find a spare piston to play with first).

Bearing in mind it's .177 and that short cylinder, is 6FP about right ? Cocking is fairly easy, so I could probably increase the preload, but don't want to stress it (although it looks very solidly made). The stroke is very short though.

Also what kind of accuracy should I be acheiving ?

Need to find some rear trigger guard screws, as mine are somewhat beyond hope £7 from Protek though..!

PS it's a "L"