45-70 is great for casting. Lever gun velocities are very reasonable for casting alloys when you take barrel length into account. The only problem is you go through alloy pretty fast with it.
I have one of Lee's six-cavity molds for 38 wadcutters in the Tumble Lube style. Out of my K-38, the darn things group about half the size of Federal match ammo. Wouldn't use anything else. Ditto their TL 32 wadcutter, though the mold has since been discontinued.
I have cast a fair quantity of 200-grain 45 SWC in the past, as well, but I go through it so fast that I usually give in to the temptation to just buy them if the highest target precision isn't required.
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