Thread: Choosing cast bullets in case I get a 45-70

405 is the "std" based on over nearly 150 years of experimentation. The 405 has better long range performance than the 340 which will loose speed much faster.
Cast bullets can be pushed to around 1800 perhaps a bit more with gas checks but the original specs push it along at approx 1400 fps and its perfectly predictable and it works.