can you fire form 7mm weatherby brass for 7stw

[joes7stw]

I was curious since you can size and fire form 300 weatherby to 7stw can you do the same with 7 weatherby

 

[eshorebwhntr]

Not sure. But I know that you can do it with 300 H&H. I started a thread a while back about the steps that I took to do it. It worked pretty well for me

http://www.longrangehunting.com/forums/f28/fireforming-7-stw-brass-300-h-h-112069/

 

[MudRunner2005]

I was curious since you can size and fire form 300 weatherby to 7stw can you do the same with 7 weatherby

No. 7mm Weatherby brass is significantly shorter than .300 Wby and 7mm STW brass.

 

[joes7stw]

Ok thanks for the info guys

 

[MudRunner2005]

Here is an image I found on Google to give you a visual comparison... The .300 Wby is on the far right.

Here is the article the image is from: http://www.shootingtimes.com/ammo/ammunition_st257weatherbymagnum_031706/

 

[joes7stw]

Is anealing the 300 h&h a must or can you just us imperial case case sizing lube and go slow with a full length size die then fire form

 

[eshorebwhntr]

Annealing is not a must. Just an extra step I took. In the past when I've fireformed brass for friend's Ackley's every now and then I would get a small split in the shoulder area. This was primarily with Remington brass. Norma or Nosler would probably be soft enough that you wouldn't have to worry about it.

My thought was that the softer anneled brass would fill the chamber better and have a lesser chance of splitting or cracking.

 

[budlight]

The best idea is go back to parent case the 375 H&H or the 8 mm rem mag.

Remington Reloading Brass 375 H&H Mag

 

[eshorebwhntr]

Would also work fine. Never done it before with 375. Can you resize the neck down all in one step or combo of bushings? When you do, what is the finished neck diameter on a loaded round?

I've also used 8mm, and it does make for good brass as well.

 

[MudRunner2005]

Would also work fine. Never done it before with 375. Can you resize the neck down all in one step or combo of bushings? When you do, what is the finished neck diameter on a loaded round?

I've also used 8mm, and it does make for good brass as well.

Never tried it, but I don't think it would be a simple 1 step process like it is when using 8mmRM brass. You would probably have to run the .375 brass through the 8mmRM die, then through the 7mmSTW FL die.

 

[Lefty7mmstw]

Would also work fine. Never done it before with 375. Can you resize the neck down all in one step or combo of bushings? When you do, what is the finished neck diameter on a loaded round?

I've also used 8mm, and it does make for good brass as well.

You will need to use a 338 or 30 cal die or bushing as an intermediate step. I usually just set my 338 win die long and neck the 375's with that, then form in the stw die, then fireform with a start load for a 7stw... Just did a box up a few weeks ago and all 20 were perfect in one pass...

 

[MudRunner2005]

.300 H&H would be even easier to form from. Just run them through the 7mm STW FL sizing die, and shoot a starting load to fire-form.

http://www.midwayusa.com/product/112095/nosler-custom-reloading-brass-300-h-and-h-magnum-box-of-25
http://www.midwayusa.com/product/176602/hornady-reloading-brass-300-h-and-h-magnum-box-of-50

 

[Lefty7mmstw]

.300 H&H would be even easier to form from. Just run them through the 7mm STW FL sizing die, and shoot a starting load to fire-form.

Nosler Custom Reloading Brass 300 H&H Mag Box of 25
Hornady Reloading Brass 300 H&H Mag Box of 50

I like the 375 better as the shoulder is more formed at fireforming. The 300h@h won't have much shoulder at all. You can do either one up but properly preformed 375 brass will actually index on the shoulder also and stretch very little...

 

[bitbythebug]

300 weatherby works great. Done it many times. 8mm rem mag and 300 weatherby are identical cases other than the shoulder radius and tyhat won't bother you when resizing