New 30/375 wildcat

[woods]

Originally Posted by elkaholic

does anyone out there have an unfired 375 case that they could measure the length of? This would be very helpful info.......rich

2.572"

[elkaholic]

Originally Posted by woods

2.572"

Thanks Woods, I'm going to get the ball rolling tomorrow......Rich

[Trickymissfit]

Originally Posted by woods

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

with what you said in your post, and the idea of using a forty degree shoulder; the case length will actually shrink about .035" when fire formed. Also it seems like I read somewhere (I don't have any load data) that the Ruger RCM case is actually based off of the .300WSM case. The Remington SAUM case is a little longer than the WSM case, and the Dakota is even longer. It's going to take several dies to get where you want to get. I'd for sure start at .375, and then drop down to .338, and finish out at .308. Gonna need a press with a lot of power. Would probably be better with a 30 degree shoulder to form 35 & 40 degree shoulder really demand a lot of pressure to move the shoulder back). Would probably be nice to have a junk barrel laying around to fire form the brass with a much longer neck reamed in it. Then after fire forming you could trim the neck to the correct length to fit the desired chamber. I'd also anneal the heck out of the brass before even starting! Don't worry it's gonna bee too hard when you get done.
gary

[elkaholic]

I'm going to get the reamer started tomorrow and talk to Hornady about dies. I plan on checking with them to see if I can get a deal on ordering multiple dies. If any of you are interested in this build, let me know right away.......Rich
p.s. with the throating on this reamer designed for a 225 grain bullet, I fully expect close to 3000' with a 28" barrel. This with a bullet of probably 370+ G7 b.c.........Rich

[Trickymissfit]

didn't realize there were drawings in the thread, so disregard my post as it's not even close. Looks to me like a .300 Dakota is the best place to start as it would require the least about of rework. But alas the case diameter is .010" smaller. Am I right?
gary

[gunman123]

Originally Posted by elkaholic

Gunman.....just realized that we are not really comparing apples to apples. What I was getting at was your "chamber length" of the neck being approx. .346". What you were saying was the actual trim length of your cases was around .320". i.e. you have approx. .026" of room before you have to trim. Is this consistent to what you believe? Do you know what the overall (reamer) length is to the end of the neck? This would take away all the guesswork.....Rich

I see what you mean now. So yes it's probably real close to .346.

Since I wasn't involved in the reamer design I didn't care what the dimensions were. Sorry I don't know what the neck length of the reamer is. I don't have any of the unaltered 375 Ruger cases left to measure.

[elkaholic]

Originally Posted by Trickymissfit

didn't realize there were drawings in the thread, so disregard my post as it's not even close. Looks to me like a .300 Dakota is the best place to start as it would require the least about of rework. But alas the case diameter is .010" smaller. Am I right?
gary

The Dakoa is a .545 case head. I thought about just building a Dakota but brass is very spendy. I think this Ruger design will work just fine now that we have a game plan......Rich