Quite a few thousand. Wore out my 50 buff/Lt bench barrel with them only used around 100,000 + before it could not keep the 1 inch X-ring at 100 yards.
Best cap for accuracy and reliance IMHO
10K plus for around $400 over many years.
Powder would be 750 #'s or so Wow that # just stunned me. Just did more figures and powder cost was about 5K or so not like todays costs.
Wow that's where my money went instead of booze and loose women!!