Looking great, Alan. I never did like the hollow based projectiles - too light for their length and poor penetration on bone. Yours should answer that problem.
: The Article above shows that very well. I, of course, have had excellent penetration and killing power from solid round balls. Unfortuneately, one must load his own ammo as a good RB load is not on the market and to get the barrels to shoot together, one must experiment.