TKS Homer - good stuff.

Also, in the same subject, is the book written by Veral Smith, "Jacketed Performance With Cast Bullets". You & all might want to google that one.

Covers heat treating and what bullet alloys actually can be heat treated - Lino and tin/lead mixes cannot as they lack the necessary arsenic quantity that is necessary. BUT, due to this multi-part bullets can be cast with softer noses, using lead/tin alloys while the rest of the bullet can be hardened to withstand high pressures and velocities.

Best to read the book.

I was able to shoot 275gr. G/C Lyman bullets at 2,700fps from my .375H&H, without leading and with 1 1/2" accuracy at 100 yards, following the instructions and using the recommended lube.