Home Forums Reloading Big Game Rifles Making 7mm Weatherby Brass

Savage_99,

You do set the headspace on the shoulder using 7mm Rem mag brass because the shoulder on the 7mm Wby is considerably farther down the case than on the tmm Rem.

That is exactly why I suggested only resizing the brass until the bolt barely closes on a case.

The fireformed brass does end up shorter than factory brass, however I gladly traded that for all the hassle, shortening the neck, turning, and chamfering, involved with using 300 mag brass.

Either way, both will work. You pay your money and you take your choice. <img src="/ubbthreads/images/graemlins/cool.gif" alt="" />

Ted

[/quote] The fireformed brass does end up shorter than factory brass, however I gladly traded that for all the hassle, shortening the neck, turning, and chamfering, involved with using 300 mag brass.

Either way, both will work. You pay your money and you take your choice. <img src="/ubbthreads/images/graemlins/cool.gif" alt="" />

Ted [/quote]
Ted:
How much shorter? I assume that the necks will still be longer than the very short necks of the 7mm RMs, since the shoulder will be set back.
Smitty of the North

Yes, that is correct. The necks end up longer than the neck on the 7mm Rem mag.

Ted

Thanks again Ted.
Smitty of the North

The 300WM brass will not work in most dies. It is longer and will buckle in the shoulder area even if you lubricate thouroughly.

How were you able to size it to 7 Wea? Seems like a whole lot of extra work?

Reloader 7RM

7RM:
Read my previous posts on this thread. I've not yet done it. Just made one unsuccessful attempt after I heard it could be done. I can post the results after I try it with new, unfired, 7 RM brass.

The advantage would be that it's cheaper than using Norma or Weatherby brass.
Smitty of the North

Here are the results of my forming 7mm Weatherby cases out of 7mm Remington Magnum cases. Using the new brass it was easy to size them, BUT it was very difficult to size them enough to get them to chamber in my Mark V rifle. I had to overadjust the sizing die in my press, and I was using a Redding Boss press, and Redding dies.

The sized case length is .059 shorter than the 7mm Weatherby case specs, and fireformed cases of the 3 that I fired, are even shorter. I stopped at 30 cases, and I'm not sure I'll do any more this way.

Thanks to Yukoner, others for the help.
Smitty of the North

smitty-you were using virgin 7 RM brass right, not something already fired in another rifle?

Mark D

Mark:
Yes, new Remington cases from Midway. When I finally got the case to chamber the first time, they were fine, but I never knew if they would be sized enough, until I finally got them to chamber. They would fit OK after that. It was like I had to finish sizing the case using my rifle. I didn't like that part. The fired brass chambered easy BTW.

I had to clean the brass off of my bolt face when this exercise was was over.
Smitty of the North

Smitty,

Obviously you have a very tight chamber. This is no doubt why you had the problem with the fired cases that you resized. That is not a bad thing to have, but would be frustrating in doing the sizing.

I know, because while I have never had any problem using 7mm Rem to make either 257 or 270 Wby, I have exactly the same situation in a lovely old Sako 3 lug L61R in 7mm Rem mag. It has a very tight chamber, and I tried three different 7mm mag sizing dies before I found one that would size the brass adequately for easy chambering.

Once fired, however, any of the dies would work. You apparently are 'enjoying' the same situation. <img src="/ubbthreads/images/graemlins/wink.gif" alt="" /> How do the new 7mm Wby cases chamber after being once fired?

Ted

Yukoner:
I'll accept your conclusions, that I have a tight chamber in my rifle. And yes, the fireformed cases chamber easily.

Thanks for your help and observations.

Smitty of the North