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I load a #0 buck pellet in 32 Longs with a charge of 3.5 grains of Titegroup and they are actually surprisingly accurate and powerful in my 32 revolvers. Just flare a good bit and seat the ball to where the roll crimp retains it in the case. The seater/crimp die winds up swaging the ball into the case and leaves a sort of wadcutter looking end. I've recovered them from shooting up a junk car and they'll go through a car door and flatten nicely.
Too bad Hornady discontinued #0 buckshot in the 5# boxes. Lucky I heard about it and bought 3 more boxes!
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I am on the cusp of doing this. Picked up a SA 1911 for my father in law to hold. (Long story)
I did shoot factory loads in it but it does bark a lot louder than I like.
Since I have an old .455 muzzle loader round ball mold I thought I'd try this.
I was looking at 3-4 grains of red dot with one of those 137 gr round balls.
I made up a dummy round one day and it does seem to load with no problems at all. Well it did until the ball got shoved further and further back in the case.
Flaring the mouth is a good tip, just got my lee flaring tool, will give me a chance to play with it.