A little something I have been working on
Brought up the idea of swaging cast lead boolits for better accuracy many years ago. Always new it worked well as I would use the lead boolits to set up my swage dies and check for proper diameters, but never got around to really testing the full potential of improving a cast boolit by swaging it in a swage die.
I have had a few customers already doing this very thing for quite a while, swaging both powder coated (PC) as well as lubed and naked cast boolits and have reported back with excellent results vs. the unswaged boolits. Swaging these cast boolits should allow for increased accuracy as it will eliminate any voids, true the diameter around the entire bullet, eliminate any runout (bend) in the nose or entire bullet, secure a perfect gas check and even add a hollow point should one desire.
What I have here is a 230 grain 30 cal cast boolit (I happen to use for a core in my 315 grain .375 bullets from scrap 223rem brass) that I casted with pure lead, then I powder coated it using Smoke's blue powder (vendor here) and last I swaged it with a simple 30 cal gas check in a simple 30 cal swage die.
Good shooting and swage on!
Brian