.338 Edge -Neck turning and accuracy

Topshot

Well-Known Member
Joined
Nov 3, 2008
Messages
1,085
I have been doing some load developement work on my new .338 Edge and thought some of the experienced shooters here might give me some ideas.
I have necked up .300 RUM cases to .338 then neck turned the cases before firing down by .0015" to even out neck wall thickness. I also loaded up some cases without any neck turning to get some comparision.
The rifle has a .370" chamber neck diameter and these fired cases come out with a neck diameter of .369".

Now the neck turned cases shoot alright, but the cases that are not neck turned shoot better! This seems a bit strange to me but it is what it is and quite repeatable. Anyone give me an idea why this might be?

The difference is so much I have considered not turning case necks at all. Is this a good idea? Maybe I should have neck turned the cases after the first firing?

I also have a .364 bushing in my D.E supplied custom Redding full length sizing die. I was thinking about getting another bushing either .365" or .366" to reduce neck tension. How much undersize do bench rest shooters etc, usually size their cases necks compared to chamber neck diameter?

The pressure needed to seat the bullets with my loading press is a bit more with the non turned cases compared to the turned cases which is expected. How much seating neck tension is desirable for best accuracy? More or less?

Thanks for your advice.
 

dirtball

Well-Known Member
Joined
Jan 18, 2007
Messages
777
Location
Fairfax County, Va
If you used the same bushing for both cases, then the ones you turned will have LESS neck tension than the ones you did not turn. If the rifle shoots better with the unturned cases then I would probably try the next smaller size bushing before I went to larger bushings.
The bench rest guys I know experiment just like you are doing and use what works.
Most use light tension, but I know one that has to put .006 neck tension on one of his rifles because that is what that rifle likes.
Dave
 

Trending threads

Nightforce has great tracking capabilities, they are rugged, a bunch of elevation, holds zero forever, and reticles are designed for long range shooting. So if you are looking to shoot long distances constantly, then you need a scope that can take the abuse. -- gilmillan1


Culture Of Excellence At Nightforce Optics
By Len Backus

A high level of quality both in production and in service. Read More


Nightforce is such a solid combo of reticle, available elevation, glass that is good enough to shoot at the longest range you can dial. Nightforce has bullet proof construction that can handle the incidental horse rolling or some other rodeo action. -- bigngreen


Nightforce ATACR Scope Review
By Jeff Brozovich

The new NightForce ATACR is for sure a top choice for any long range shooter. Read More


The total package. Nightforce is the best I have used as far as turret feel and solid detents. I have never had one that didn't track right on and always return to zero. Nightforce NXS is the best value for everything I need. -- Broz


Nightforce Velocity 1000 Reticle Review
By Scott Shreve

I think Nightforce knocked it outta the park with this reticle! Read More

NightForce


Top