I've decided to take on this little project because I did a little trading and ended up with a 17fireball. Not saying I'm doing it right but it's working so far. I'm cutting the 223 at the shoulder as I would for 300BO then I annealed the area that will be the neck and shoulder, then resized it in full length dies to 300BO then 221 then 17FB the cases look good but I'll have to turn the necks. My RCBS turner came today and it fits my redding trimmer, I'm still waiting on the 17 reamer/pilot to get here. I tried different brands of brass, it looks like if I use Win. I might get away with not turning the necks but all the other brands turn out to thick (FC,LC,Rem.) After turning I guess I'll anneal it again.
Hunterapp, thanks for all the info you shared!
