You can pound a cast bullet all the way through. Just make sure the lead is soft and oiled. Lead ball is easier. If you are getting leading in your bore with cast you are too small. At 1050fps. You can use pure lead and not have leading, with a bullet that matches bore diameter. You could use the .429 bullets as long as they fit in your cylinder. If they need to be pressed in, it could create pressure problems. Do you cast your own?
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