Re: 22/243 rifle:
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I've been shooting mostly the 22-243 in the Ackley configuration. I regularely use 48.2gr RE22 under a 75gr A-Max moly bullet that is loaded .007" into the rifling. Velocity is 3,670 ft/sec. Lapua brass life has been good.
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What barrel length are you shooting that load out of? I don't know of any .243s that can get that kind of velocity with a 75 grain bullet... heck, I shoot a 6mm Rem. and can only get about 3600 out of a 75 V-Max. I bet case capacities are almost identical 6mm Rem vs. 22/243AI... so, at equal pressure the 6mm should have a pretty good advantage in the velocity dept, but this is apparently not the case.
I guess I don't understand how a 22/243 can shoot a 75 grainer faster than the .243 can... if this was common wouldn't a 7mm Rem. and .264 Win. shoot 140s at the same velocity? Or a .270 should shoot 150s as fast as an '06... right? Please understand, I'm not calling BS... just trying to figure out what the variables are that allow this type of phenomenal velocity gain to occur.
Dirty Dogs... Down Dirt Cheap!!!