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no such thing mate, its all a quest for knowledge

the 44 mag using .44 special cow boy loads is a real low cost way to dip your toes into seeing if subsonics work for your type of hunting

impossible
the bullets in the 45-70 are larger than the hole down the barrel in the 44 magnum

10.9mm for the 44 mag
11.6mm for the 45-70

44 magnum makes a perfect sub/super gun, Im a big fan of mine
gunworks sell fiocchi 44 special that is standard subsonic that you just put in your gun and shoot