I have ordered two of your cans, 30P-1 and 22L-1, they have arrived at my FFL and just waiting for tax stamps. The 30P-1 will be used on 3 rifles, Savage 12 LRPV custom in .243 with a 1.0 barrell factory threaded and I will be threading 2 rifles, one a Remi 700 BDL with a varmint (0.820) barrell in .243 and a Remi 700 CDL SF II in .257 Weatherby with a smaller contour barrell. I know I should have plenty of shoulder on the BDL, however I am not sure on the CDL, I am not home and I can not measure, which brings me to the question, what is the minimum shoulder you reccomend for the 30P-1? and will it be better to thread the .257 WM in 1/2-28 and use an adapter to 5/8-24? BTW, I had an opportunity to test fire the 22L-1 on my Pac-Lite Mark III at my FFL's indoor range and everyone was amazed by how quiet it is and specially the lack of first round pop.