Thread: Slow Powder, Heavy GC boolit, anyone got a ballistics calculator?

Originally Posted by Driverman

Im looking forward to your results. I have been shooting cast in 303.s for nearly 50 years and have settled on fast pistol powder with 220 grain mixed alloy boolits at 1800ish fps. Best accuracy tho is if kept below the rpm threshold at 1650 fps. If you've looked up Larry Gibson on the cast boolit website he has several hours reading on rpm threshold and cast boolit alloy ,fit and lube.

LG has some posts there with very fast velocities, but hard bullets and target shooting. Someone there praised a go-to load with 35grains H414, similar boolit to mine, and 1970fps velocity. Don't know what the velocity will be for my current load, except it will be survivable by the boolit. Don't have a chronometer. Going to an evening shoot Thursday night at the Bruce Rifle Club, usually time for some messing about after the comp itself (in which I'll use my known-quantity HXP .303).