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My new (to me) Investarms 58 was built in 1977 or 1978. It is 15/16 across the flats. One of the members here suggested reduced loads for a barrel with thinner walls. The loads below come out of the Investarms Manual. Black powder only.
I intend to you Swiss ffg.
I really don't see any reason to load that much powder but does anyone have a reason to reduce these maximum loads???
.58 .560 Round Ball 110 grs. ------
.58 460 grs. Minie Ball 100 grs. -----