Just reloaded some shotshells:
use first-fired WinAA hulld,
loaded with 69 grs FFG,
three T/C wonderwads as over-powder wads,
1-1/8 oz of #7-1/2 shot,
crimped with MEC 600JR with depressed center, not like Factory.
Will fire couple shell in M97 (1927 dated) then if no observed problems, will try in Remington 1894 SxS, barrels appear damascus, but used penetrant Dye check and didnot see any spiralling as a Damascuc should.
Posted also in Blkpowder forum