reforming 338 Lapua

runningw · #1 07-09-2008, 05:25 PM

Do any of you guys have any experience or advise on reforming 338 Lapua to 7mm Rem mag? Headspacing is off the shoulder

Thanks

KRP · #2 07-09-2008, 05:55 PM

Somewhere in this process you are going to have to shrink the case head ~.050" and swage a belt onto it. Can't be done, if you try it I would like to hear the details.

runningw · #3 07-09-2008, 06:28 PM

When the cartridge is headspaced on the shoulder no belt is necessary.

BHP9 · #4 07-09-2008, 07:17 PM

What KRP is saying - it can't be done.

The case head diameters are 2 different sizes.

0.588" for the .338LM. The parent case is the .416 Rigby.

0.532" for the 7mm Rem Mag. This was a propriatary case from Remington.

Also the .338LM is a beltless case.

KRP · #5 07-09-2008, 07:20 PM

The 7 RemMag has a belt, regardless of whether you headspace off the shoulder the case has a belt and the chamber is cut for a belt.

runningw · #6 07-09-2008, 08:13 PM

I did not come up with this idea, I read a semi-detailed description of the process some months on one of the reloading forums and can't find it now. I was just trying to see if anyone else had done this.

BHP9 · #7 07-09-2008, 08:45 PM

Quote:

Originally Posted by runningw

I did not come up with this idea, I read a semi-detailed description of the process some months on one of the reloading forums and can't find it now. I was just trying to see if anyone else had done this.

Could it have been a 7mm-338LM?

In other words a.338LM necked down to 7mm. The .338LM has also been necked down to.30 cal.