Thats all I do ... Use a little Harbor Freight 2" chop saw. Jig slices off at the shoulder 1.375" I anneal the necks. I then size the batch. Tumble in kitty litter. Trim with a Possum Hollow trimmer to 1.365" Slam primers, powder, bullet then crimp with Lee factory crimp die. I use about 19 grains of H110, CCI primers, and Barnes 110gr TTSX. Sub MOA at 100 yards. Chronograph ~2300 fps
I havent used factory 300 BO Brass. Although I did snag 200 Hornady cases.
This but I also picked up a LE Wilson Head Space Gauge..just to double check..Have done several K Between sub and super I use H110 Lil Gun and h1680