I am on my last tin of JSB exact jumbo heavies in .22 cal and thinking about trying the exact jumbo monsters. I am hoping someone can fill me in on the benefits or negatives of such a change in weight in ammo. The jumbo heavy weighs 18.9gr and the monsters are listed at 25.39gr so that is a pretty large jump. Velocity would not be an issue at this point as it is adjustable, just concerned I may have to change many things to keep my tune, including TP size, and hammer strike? I should mention the jumbo heavies are flying true and hard, but +fpe is addicting. I am using the jsb's in the largely modded QB78D, and AT44.