New to casting, I'm going to try my hand at casting a 400 gr bullet for my 40-65, I have some 1-20 material I figure I'll use for BP loads,but also want to cast dome for smokeless. I'll be shooting around 1200 fps loads.I was thinking Lyman #2, but wanted to ask first. Thanks
Why not work up a load with the mix you already have in the pot and see when accuracy falls off. You might not need to complicate life so much. 1-20 is about 10 BHN.
For smokeless, BHN 15 will get the job done.
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Last edited by 243winxb; 11-26-2023 at 09:09 AM. Reason: Add chart
At those speeds, pretty much anything will work well.
You're not quite at a threshold where you'd need the harder alloys to keep the Leading of the barrel down.
I'd put just enough 'goodies' in the alloy to get a good fill out in your molds, and not worry about the hardness.
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Your 20:1 will work well for both applications.
Good Luck,
Rick
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