Originally Posted by
jid1877
2f says it is for 45 or larger, and 3f is for 50 and smaller. Can 3f be used in a 54 safely?
Yep, in fact, back in the 1700s there was only cannon grade and musket/rifle grade powder...Many of the tales we hear about today were created in the 1940-60s when muzzleloading got popular...
FFF is perfectly fine to use in larger bores...