7mm rem mag

[model 12 toby]

has a 7mm rem mag ever been necked down to a 6mm rem mag? and also what does it take to change 7mm rem mag down to 6.5 rem mag? barrel change and brass reworked?

 

[OKIE2]

you need to contact RCBS they make dies to reform cases like you need.
but you can buy what you want at midwayusa.com
6.5 rem mag cases $77.00 per 100 cases.
I just bought some 2 weeks ago.
Or buy once fired 6.5 rem mag cases.
Or you can just neck down the 7 mag to 6.5 and you have the 264 win mag cases

 

[model 12 toby]

i was just thinking about the future if i ever need to get another barrel for my 7mm rem mag if it'd be possible to get a 6mm and make a 6mm-7mm rem mag. damn that would be wicked.

 

[RonAKA]

has a 7mm rem mag ever been necked down to a 6mm rem mag? and also what does it take to change 7mm rem mag down to 6.5 rem mag? barrel change and brass reworked?

The 6.5 rem mag is already a commercial cartridge -- 264 Winchester Magnum. I have two, and they are barrel burners. A 6mm would be brutal on barrels.

 

[OKIE2]

has a 7mm rem mag ever been necked down to a 6mm rem mag? and also what does it take to change 7mm rem mag down to 6.5 rem mag? barrel change and brass reworked?

The 6.5 rem mag is already a commercial cartridge -- 264 Winchester Magnum. I have two, and they are barrel burners. A 6mm would be brutal on barrels.

Just how many barrels have you burned out?
the 264 is no worse that the 7 mag it is the same case only .020 larger neck and the 6.5 rem mag is the same size case as the 30-06 who burns out 30-06's?
I have a 6.5 rem mag and 2 264's been shooting them for several years no problems.
But I do agree with you on the 6mm-7mag.

 

[model 12 toby]

i was just thinking. i 6mm bullet being fired out of a 7mm rem mag cartridge. not the 6.5mm. i think i screwed up when i typed it it. just the 6mm-7mm rem mag idea is what i was thinking. whoops

 

[model 12 toby]

if it only could last 1000 rounds it'd be something. ;D

 

[RonAKA]

"Just how many barrels have you burned out?
the 264 is no worse that the 7 mag it is the same case only .020 larger neck and the 6.5 rem mag is the same size case as the 30-06 who burns out 30-06's?"
-------

Two barrels burned out, and about 100 rounds into burning out a third one. Don't have real good records but they each lasted about 800-900 rounds. One started to keyhole the bullets, and the other one had groups open up from close to 1" to 3". I guess still good enough for big game, but a little frustrating at the range.

One formula I have estimates accurate barrel life. I ran the calculation for the 338 WM family of cases, as well as a 6 mm version, and a 30-06 for comparison. Here is what I got:

338 WM - 1760
300 WM - 1230
7mm RM - 1150
264 WM - 810
6mm RM - 550
30-06 - 1920

I think the pattern is that as you decrease bore and keep case size the same, you put the same fire down a smaller hole and accelerate the burning effect.

 

[OKIE2]

You may be right with your numbers.
But The only barrel I have used up was a 25-06 it started key
holing but it took my 25 years to do it and this was the only rifle I had for that time and it was used when I bought it.

 

[JohnnyJohnson]

A 6MM/284 or a 6MM/270 (243 Catbird) is going to give you about all you're really going to get out of a 6MM.

 

[model 12 toby]

anyone ever neck down a 243 to shoot a 22 caliber bullet?

 

[OKIE2]

yes been done many times .
I have a 22-243 barrel on order now
and a 6mm-06

 

[model 12 toby]

does it out do a 22-250? got any numbers?

 

[OKIE2]

a friend has a 22-243 and he is getting 4350 fps with 40 grain bullets and accurate too.

 

[model 12 toby]

That's insane

 

[TheOtherZilla]

Check out the 22-243 Middlestead.

link http://www.accuratereloading.com/22-243.html