Bolt face on the donor action is .473 (it is a .243 sporter barreled action)
I have about 250rds of .243 brass (rem/win mix) so I'm leaning towards an earlier suggestion of a 22-243. Started to read up and I guess there are two main versions. The first is just a necked down .243 and another has a 30 degree shoulder and needs to be fireformed?
Two questions on 22-243--- 1. What is the best way to size brass for it? Neck size to .224 and then would a .243 bushing die work? 2. What are some ideas for powder charges. I have RL19, 22 and H4831SC in abundance. I can get 4350 and H1000 easily too.
