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338 edge 30 or 40 deg.?

 
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  #1  
Old 09-15-2010, 07:22 PM
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338 edge 30 or 40 deg.?

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
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  #2  
Old 09-15-2010, 08:10 PM
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Re: 338 edge 30 or 40 deg.?

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
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Old 09-15-2010, 08:17 PM
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Re: 338 edge 30 or 40 deg.?

Thanks Tom That puts a perspective on it that I wasn't thinking about.
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Old 09-15-2010, 10:07 PM
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Re: 338 edge 30 or 40 deg.?

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
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Old 09-15-2010, 10:11 PM
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Re: 338 edge 30 or 40 deg.?

Thanks Neal.
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  #6  
Old 09-15-2010, 10:56 PM
B23 B23 is offline
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Re: 338 edge 30 or 40 deg.?

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.
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Old 09-16-2010, 07:57 AM
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Re: 338 edge 30 or 40 deg.?

Quote:
Originally Posted by B23 View Post
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
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