Originally Posted by joshiwa220
Thanks a bunch. I read about your 30 375 si... Version. You got something really nice going there and have put slot of thought into everything. I would definitely like to know how everything is going now and once you get all your parts finished in feb.
Does anyone know if gunwerx will sell their brass or will we have to make our own. From what I understand I will need a ground down 375 die first and bump the shoulder back a little. Then go down to 338 in a shorter die like a 338 rcm or a ground down 338 ultra? Then neck to 30 with something shorter and finally size with a 7 mm neck and trim. Could I shoot then or should I finish from 30 with my 7 lrm die or what ever I make it?
Gunwerks will only sell their brass to people who buy rifles from them. Once I get my rifle chambered I will get the sizing thing perfected but here is what I've done so far.
I cut .080" off of a full length 375 Ruger die and bumped the shoulder back. Next, I ran it thru a .338 RCM die set to neck size and make sure I only go back to the new shoulder, (same 30 degree angle). I then ran it thru a 300 SAUM die set to neck size and leave a little false shoulder on the .338 neck; just a few thou. This will be my headspacing angle. If I had my 30/375 S.I. dies, I might try skipping the 300 saum step and try to form the 40 degree shoulder at that time, but I really don't think that will be the best approach. My best guess is that the best approach will be to not use the S.I. die and simply fireform after using the SAUM. The case will need a little forming anyway to blow the taper out of the case body so I think this will work just fine. Basically, most of the forming will be just blowing .006" taper out and changing the 30 to a 40 degree shoulder at this point. It sounds a little tedious, but really wasn't bad at all when I tried it. With the throating in this chamber, the round should duplicate the Dakota at half the brass cost..........Rich