This may turn in to a major deal! I have spoken with several people including Hornady, Gunwerks, Pacific tool, and others and it sounds like it could be more trouble that I want! To go the Hornady route would cost about $600 before you even got to the full length die. Gunwerks makes brass for their 7 LRM but admitted it was a major endeavor. They will get back with me next week to advise me whether or not they would sell brass? I still think a person might be able to form cases without using the 4 steps Hornady suggests, but you might end up destroying more cases than you would like. I'm also not too sure that it might not require some inside neck turning? Anyway, I'm going to kick this around some more before I give the go ahead on the reamer. The SIN case would also be a lot of hassle, and the Dakota cases are near two bucks a pop. The only easy way to do this would be simply neck down the 375 case to 30 without moving the shoulder and that would give you a .253" length neck which I don't like.......Rich
If you recall in the original thread I mentioned that the case grew .010" when I necked down the 375 Ruger case to 30 caliber. That will increase the neck length. Also you should gain some more when firing the cases. If you sharpen the shoulder you will negate the lengthening of the case and it may shrink after firing (like my 280AI does), but if you keep the original shoulder angle then you should experience normal lengthening.
Just thought I'd throw that in
If you can read this, thank a teacher.......if you are reading this in English, thank a soldier.
What is causing the issue, moving the shoulder back and changing the angle?
Yes, that's the problem. As Woods says, blowing the case out always shrinks the length somewhat, but that should offset with the lengthening he mentioned from necking down. If you stayed with a 30 degree shoulder and left it in place, you might end up with .270" neck + or -. This would be the only reasonable (expense wise) way to do it but the neck is still too short for my liking. I realize some others have as short or shorter necks (300 WM). Just my preference........Rich