Veral Smith’s book gives good info on bullet fit and how alloy plays into the equation. Not required reading but something that might help and is interesting.
Are the throats in your cylinder uniform? That’s a bigger hurdle than them being oversized.
If you have a welder you can make a couple ingot molds by splitting a piece of 1 1/2” black iron pipe and welding caps of sheet steel on the ends. Or swipe a muffin tin from the Mrs. Ingots don’t necessarily need to be pretty, just manageable sizes.
