well, the 3f swiss is way to hot for the large bores. 3f swiss is primer powder/small bore stuff.
for the .54,, 1.5 swiss is the most efficiant, (at 70 grs) Yes powder use equizilants can be found, Go ahead try it,,,,,but your going to burn alot of powder finding that 70 grn's( by volume) of 3f swiss ain't the ticket for the .54 cal.,, now I don't want too get into the mearuremnet argurement again,,,,,,,everyone measures by volume,K? geez.
ox-yoke?, you'll be fine,,,,,the employies bought the company. it was a bail out thing,,,there might be a name change/same stuff.
now my question is,,Have ya ever seen,, a Top Shooter,,local,state, or Nation wide,,,,use ox-yoke patch?