I use the Missouri Bullet Company's 405 grain lead RNFP (round-nose flat point) "buffalo bullet", Brinell 18, without a gas check in all my 45-70s -- nice and slow in the Trapdoor and the 1885, a little faster and nastier in the 1886 and the Marlin, but never outright speedy. They're great bullets and the Missouri folks give great service. No critter I've hit at any range with a 405 has gone more than a few yards.