Thread: 7mm mag and 180gr ELDM

Originally Posted by ChrisW

Thanks for the info. The reason im considering running a 7RM as opposed to something more exotic is due to the overall cost to play, & availability of brass.

I already have a .338lm which has expensive brass (and projectiles). A quick look online places the 7mm blaser mag brass right up there with the .338LM, or maybe even more expensive - which is just not what im trying to achieve.
Im trying to have similar ballistic performance to my .338 with less hassle involved. Less component costs, less recoil, less fuss, and similar or better ballistics.

I think the two big selling points for me on the basic RM are -
A - the brass is comparatively cheap and available
B - the action for my rifle is very large so I should be able to seat the projectiles fairly far out as not to dig into case capacity (if I choose to run a mag). I think more modern cartridge designs alleviate that issue in a "normal" sized action, but I don't think its an issue for me as the action is massive (TRG M10). If I run a ,300wm mag its can take a COAL of 3.5", or if I bent the feed lips on a .338 mag a little bit I might be able to run a .338 m10 mag which allows for a 4" COAL.

If 7mmBM had comparably priced brass id consider it, but due to above reasons I don't think its the best option for me.

What about a 7mm Practical (7mm-300WM)

It should do what you want easy. Cheap and easily available brass.

It'll put you much closer to the ballistics of your 338LM
Without the expense of 28 Nosler brass

Originally Posted by GWH

What about a 7mm Practical (7mm-300WM)

It should do what you want easy. Cheap and easily available brass.

It'll put you much closer to the ballistics of your 338LM
Without the expense of 28 Nosler brass

Now we’re talking. How does one make the brass?
If made by die sizing it could suit me, if it needs fire forming then it’s not for me.

Originally Posted by ChrisW

Now we’re talking. How does one make the brass?
If made by die sizing it could suit me, if it needs fire forming then it’s not for me.

A straight neck down on 300wm

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Originally Posted by ChrisW

Now we’re talking. How does one make the brass?
If made by die sizing it could suit me, if it needs fire forming then it’s not for me.

Talk to Grant, he has built a few now