I just received a 100 round box of 22CM Alpha brass. The factory Alpha brass is measuring on average .251. Loaded, it is also on average of .253. I worked up some loads earlier this week with Berger 80gr VLD bullets, but have not gotten out to the range yet.
Before receiving my Alpha brass, I was necking down 6mmCM Lapua brass. With it loaded it is measuring on average .2545. Showing that it is thicker brass. I'm using my Redding 6.5CM Competition Bushing Neck Sizing Die and stepping the neck down in 2 steps to get down to 22CM. Final bushing size I have is .253. Looks like I need to order a .251 bushing for the thinner walled Alpha brass. The Lapua brass with Berger 85.5 long range hybrid target bullets (not VLD as written in picture below) and 39.2 gr of H4350 with CCI 450 magnum SRP got me the best results with an average velocity of 3137 fpm. SD=4 ES=8.