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I would use Fg or at most Swiss 1 1/2 Fg (Their numbers 4 and 5 in the home market) in a 2 7/8" just to keep the recoil manageable. FFFg is most often used to try to gain a little extra velocity in a shorter case or to try to refine accuracy. Not a first choice.
As said you need the right diameter bullet and a good lubricant. There are formulae available if you cannot get SPG or DGL. But rubbing a bullet with a candle is not the way to go and your "expert" is an idiot.
Shooting .45x2.1" (.45-70) in a .45x2 7/8" (.45-110) is a waste of time and ammunition if you want to do good target shooting.
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