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Post by boolitdesigner on Oct 10, 2021 18:22:15 GMT -5
I cast 45-70 hollow points out of 95-5 and they open up violently at 1200fps. The 2-2-96 the op's original post asked about is around 11 brinell. Your 20:1 is adout 10. They will behave pretty closely with the same bullet. The 2-2-96 will reach about 15-16 brinell if water dropped. Usually, equal parts of tin and antimony don't age harden to a higher hardness than if you air cool them. The tin binds the antimony and little hardness is gained.
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bigbore5
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Post by bigbore5 on Oct 11, 2021 1:23:00 GMT -5
The 2-2-96 the op's original post asked about is around 11 brinell. Your 20:1 is adout 10. They will behave pretty closely with the same bullet. The 2-2-96 will reach about 15-16 brinell if water dropped. Usually, equal parts of tin and antimony don't age harden to a higher hardness than if you air cool them. The tin binds the antimony and little hardness is gained. The 15-16bhn number is from the manufacturers site at National Matals. I haven't tested it myself. The only alloy I have ever bought premade is linotype. Other than that, I blend my own or use wheel weights. Personally once past @1250fps I don't use hollow points in big bores. For the 357mag I will go to 70/30 COWW/SOWW pc'd. I'm still experimenting with the max, but a 90/10 mix did ok this weekend at 1500fps on waterjugs. Solids in the big bores show some expansion and still stay in one piece up to 1600fps cast in coww+2% tin, pc'd.
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