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A gentleman who has certainly devoted himself to making 45-70 rolling blocks shoot is Paul Matthews.He has written a number of books on the subject.You will get a lot of ideas to pursue.
I think with BPCR each one is unique,and you have some discovery to do.
Alloy hardness,bullet slump,neck hardness,bore ride,hot vs cool primer,etc
Venturino's "Shooting Buffalo Rifles "is very good.
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