Buy the starline brass, the used brass that I bought had crimped primer pockets and needed swaged.
I bought a Midway 18 inch barrel and put it on an AR.
The starline brass is supposed to be thinner in the neck and would chamber easier with a larger bullet.
I size my cast bullets to .356 and have good results. I load H110 or Win 296 with good results.
Shot a 150 class whitetail thos fall at 200 steps with cast and powdercoated bullet, hi shoulder shot and took him off his feet.
For Iowa laws, it could not have worked better
All the best,
Ray