338 edge 30 or 40 deg.?

sdeering · #1 09-15-2010, 07:22 PM

What would you go with? I hear the 40 deg is easier on the brass, less strech.
I will be ordering a chamber reamer soon and I may just order a resizing reamer as well. Anyoune used both? Is the 40 or improved that much better?
Thanks for any help deciding.

Stephen

specweldtom · #2 09-15-2010, 08:10 PM

This is only my opinion, but the 30 deg shoulder would be my choice. The 2 most accurate cartridges I know of, 6mm PPC and 6mmBR, both use 30 deg shoulder angles. Whether or not a 40 deg shoulder is as good or better is beyond me, but for proven performance, I know that 30 degrees is good. Seems like it would be better for ease of feeding too.

Good luck, Tom

sdeering · #3 09-15-2010, 08:17 PM

Thanks Tom That puts a perspective on it that I wasn't thinking about.

hammertyme · #4 09-15-2010, 10:07 PM

My 300 RUM has a 30 degree.
My 338 RUM has a 30 degree.

All of my Edges have 30 degree shoulders and I must not be shooting enough as I have yet to trim a case. Very happy with the Edge just the way it is. I see no benefit in changing the shoulder angle.

Neal

sdeering · #5 09-15-2010, 10:11 PM

Thanks Neal.

B23 · #6 09-15-2010, 10:56 PM

I was talking to Dave Kiff @PTG afew months ago about the reamer print I was using. I told him I've read that anything more than a 37.5degree shoulder angle was counter productive. Now I'm not sure if I used the correct technical terms but Mr. Kiff told me he will build anything but that he wouldn't recommend improving anything over 37.5 degree shoulder angle.

dirtball · #7 09-16-2010, 07:57 AM

Quote:

Originally Posted by B23

I was talking to Dave Kiff @PTG afew months ago about the reamer print I was using. I told him I've read that anything more than a 37.5degree shoulder angle was counter productive. Now I'm not sure if I used the correct technical terms but Mr. Kiff told me he will build anything but that he wouldn't recommend improving anything over 37.5 degree shoulder angle.

I had the same conversation with Dave a few months back about a 338 LM IMP and we settled on a 35 degree shoulder, pushed the shoulder forward about 40 thou and modified the throat and so far it is working well.
Dave