What is it with folks and bullets hard as rocks?
I spank my 44MAG shooting a 240gr Ranchdog bullet with gascheck past 1700fps and it is cast lead + 3% tin and a gascheck. There is no magic but proper bullet fit. I shoot a Lee 158gr .357 bullet past 1200fps from a 6" barrel, nothing but lead and the above mentioned 3% tin, not even a gascheck.
You cant make a bullet hard enough to compensate for pi$$ poor fit!
Ever read anything by an old geezer called Elmer Keith?
He considered a bullet with 6% tin, hard cast (1:16), and used nothing harder in all his 357MAG and 44MAG shooting and you can hardly argue with that?Comments on cast bullet alloysElmer Keith's favorite cast bullet alloy was 16-to-1 lead/tin, which has a BHN of only 11. This is the alloy that gave a roaring birth to the .44 Magnum using plain-based cast bullets loaded to 1400+ fps. Properly loaded and lubed, Elmer's alloy will leave a magnum revolver barrel shiny and clean after a long day shooting.
I can warmly recomend "wasting" a couple of hours reading these pages on cast bullets (considered the best there is on the net!)
From Ingot to Target: A Cast Bullet Guide For Handgunners, Table of Contents - Fryxell/Applegate