I'm patching a 200g plain base for a 7,62x54R.
They are cast from a Cu babbit enriched alloy. These first ones are actually powder coated because I had already done it for a previously failed project.
The bullets sized back to .303 easily in two steps. .311-.309 then to .303 That's about .0015 over bore. It's the only sizer I have access to that's close enough. [for now]
The paper is Southworth 25% cotton business paper. It wraps easily and once dried is TIGHT!
My biggest question though, is there some limit to sizing back patched bullets? After the patch dries it measures about .315 but with a little dab of Johnson's paste wax, they slid through a .311 sizer with ease and the patch is NOT torn or damaged at all. The only thing is, they come out of the sizer looking like they were patched in wax paper. The look of the white paper wrapping is totally changed. Obviously looks mean nothing, only results.