Originally Posted by Ratinator
What's to say that a barrel running at legal limit with a jsb heavy will still be legal with an AA express ?
I think the best and easiest solution is to let the Marshall load the gun.
absolutely correct. springers for example generally run greater efficiency with light pellets, PCP generally with heavy. but a bisley magnum and JSB heavy maybe circa same weight, but as differing alloys maybe used give different velocities. if you use a certain ammo in comp thats what you test it with.