My 45/70 is 14". If your shooting full house factory loads from a 14" barrel, you will have significant muzzle flash, which means suppressor wear. If you do your own loads to burn completely within the 14", no flash, no excessive wear.
For example, I'm using 450gr cast bullets on about 15gr of ADI AP100. Complete burn within 5" and should get about 1000fps (haven't had a chance to chrony yet)
All of my numbers are based off quickload software, extremely useful for reloading.
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