The endless joys of shooting springers.... and perchance pcp's also
I recently discovered (by complete accident) that different batches of pellets group differently (I use 50m for my pellet batch testing) at different muzzle fps.
I have different batches of both AA Field and JSB Express, tweaking by as little as 15fps brings astonishing (at least to me) results.
My benchmark is <2.5 cm at 50m off the knee sitting (aka primary FT position)
I normally batch test pellets at around 775 (8.4g) and 805 (7.9g) it had never occurred to me to test at differing velocities.
Chatting with a true guru (ex advisor to UK 10m squad) he confirmed my discovery.
Long story short, one batch of 8.4 better at 785fps, another better at 770fps, the same equation with 7.9's...
As if it wasn't complicated enough
but, all good fun