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Yeah, a pure lead ball obturates when it hits the forcing cone, course it is already expanded some from being pushed in to the chamber mouth and shaving lead off the circumference and now it's being swaged down to groove diameter. That usually is about a ball diameter in forward movement.
If you shoot an undersize ball and it doesn't fill the grooves after transitioning the forcing cone, and gas gets around it, my money would be on there being lead in the bore.
I see this all the time in BP cartridge rifles with my hawkeye bore scope. Usually the owner will swear he has no lead in his bore after cleaning but it very often is there anyway. MD
If you shoot an undersize ball and it doesn't fill the grooves after transitioning the forcing cone, and gas gets around it, my money would be on there being lead in the bore.
I see this all the time in BP cartridge rifles with my hawkeye bore scope. Usually the owner will swear he has no lead in his bore after cleaning but it very often is there anyway. MD