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338 edge 30 or 40 deg.?

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Unread 09-17-2010, 09:52 AM
Platinum Member
Join Date: Jul 2004
Location: Texas
Posts: 7,239
Re: 338 edge 30 or 40 deg.?

Originally Posted by sdeering View Post
Much appreciated. I was thinking friction of powder or turbulence must be the factors.

There is a theory that the sharper shoulder angle improves accuracy and efficiency due to
flame front improvements but it is just theory and the 30o shoulders have proven themselves
in bench rest cartriges as stated.

The only provable thing is that less body taper improves the grip on the chamber lessening
bolt loading. one of the reasons that the "Improved cases" will show less signs of pressure
because the case is not pushed back as hard on the bolt.(It's not much but it does seam to
make a difference).

The down side is it is also harder to extract if loaded hard.

Just an observation


Last edited by J E Custom; 09-17-2010 at 03:07 PM.
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Unread 09-20-2010, 09:11 PM
Junior Member
Join Date: Mar 2008
Posts: 18
Re: 338 edge 30 or 40 deg.?

Thanks fellas I have a regular edge reamer on the way.

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Unread 09-21-2010, 11:50 AM
asa asa is offline
Bronze Member
Join Date: Jul 2006
Posts: 73
Re: 338 edge 30 or 40 deg.?

I have a .338 edge a.i. 40 deg my buddy has a reg .338 edge, both guns built by the same smith, there is no real case capacity improvment to talk about, both guns shoot very well ,I can get a 1/2 grain more powder before seeing psi signs. on average my gun shows about 30 fps faster then his but I also have 1 " more barrel. The only real difference I see is that my reloading dies cost double of his. This is our findings in our guns take it for what it is. thanks
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