Originally Posted by
geargnasher
RX-22 is a good powder for heavier cast bullets in medium sized 30-cal cases (.308 Win/'06-ish) at very high velocity and responds really well to a little granulated buffer on top. It likes as short a jump to the rifling as possible in those applications, particularly if no buffer is used.
Regarding rifle quality, a lot of folks would be astonished to find out how well a Marlin lever action, an M1A, or an AR-10 can shoot with cast bullet loads carefully tuned to their liking. Look at some competition scores for cast bullets fired from un-modified military surplus rifles, very impressive groups are being shot from them on a regular basis. Jacketed bullets only set the benchmark for accuracy in rifles that they fit well and with loads carefully tailored, and only premium match bullets need be considered. Otherwise, it's probable that cast bullets will do better, albeit at slightly reduced velocities.
Gear