What chambering for mag fed .338 (ELR)?

[Alex Wheeler]

We shoot a match on paper at 2000 yards. One thing I have noticed is the huge difference in vertical dispersion between cartridges that are still super sonic and those that are trans sonic. I know there are ways to deal with that, but if its possible I will always shoot a cartridge that stays super sonic to the target.

 

[Dud]

I don't think I can fit a cartridge that stays supersonic at 2,500 in the action.

I know I can't fit it in the magazine.

My goal is to have a 250+ grain lead core bullet load that fits in the magazine and shoots well at 1,000 yards to maybe a mile and single load a copper solid for 2,000+ yard shooting.

The ELR loading shouldn't be supersonic at 2,500 or at least I think that is really optimistic with the amount of powder I can burn.

The reason for a 338 is to get more visible splash on target, not fantastic BCs or velocity.

It's scaling up to a mini big boomer. Hopefully I'll find a brake that isn't too obnoxious. A friend of mine has an Armalite brake on his 338 LM and while it isn't quite the disturbance of a tank braked .50 BMG, its muzzle blast seems sharper. I really wish suppressors were legal here, it would be the first piece on my shopping list so that it would be waiting for me before the first firing.

 

[Alex Wheeler]

Bat machines their HR action for the CFE-9 box which is about 4" fyi

 

[Dud]

My action and chassis only take a CIP length 3.85" magazine.

I got an MDT 338 LM magazine second so I have something to play around with.

I'm not committed to cases that fit that magazine, I can cut out the rib if I have to but it will be better than an empty magazine well.