You're a purist, I can respect that. Lube has worked for many years
I can't stand lubes messy to apply, gum up your loading dies and smoke.
I have polished many cavities in multi-cavity Lyman molds where the cavities were different sizes.
When I get time I going to try polishing just the drive bands leaving the GC shank and nose alone.
I've been looking for a 268645 off and on for years, they're way out of production. It should be just about the perfect bullet for the Swedish Mauser even with just the gas check and base band in the neck. All of the Lyman designs ending in 644 and 645 with the tapered transition from nose to body are excellent.