Peterson 7mm Remington Mag "Long" brass in stock @ Grafs.com

[martinakl]

I stumbled across this today.

Peterson Brass 7mm Remington Mag Long Unprimed Bulk Box of 250 - Graf & Sons

This is a Bulk package of Peterson Cartridge casings, they will not come in one of their plastic ammo boxes. Made in the U.S.A. Peterson Cartridge Co is committed to producing Match-Grade Brass that enables our customers to get more reloads per casing than industry average. Warning: Only use...

www.grafs.com

 

[josh0619]

Anyone know how much longer it is?

 

[claybreaker]

I don't know how much "longer" it is if any. But the "long" it is designed to be head spaced off the shoulder instead of the belt.

So the overall length may not be any longer at all.

 

[Bob Wright]

It's so new, Peterson doesn't list it on their web site.
But, Grafs has it. Same as the 300 Win Mag Long approach I reckon.

 

[huntinfool18]

the "long" designation being Headspaced off the shoulder isn't entirely true. The 300 win brass vs chamber dimensions aren't the same. I believe the belt to shoulder length is about .01-.015 different so a fired piece of brass has to expand and form into the chamber. All this expansion can cause early case head separation. Peterson's attempt to resolve the issue is the make brass that is longer andmatches the chamber specs. It still headspace's off the belt and works in factory chambers
I dont know if that is an issue with the 7 rem as well. Must be if they are making "long" brass for it.

 

[claybreaker]

If I'm mistaken I apologize, as I have not looked at or nor examined the drawings.

I was trying the reduce this quote from the Grafs.com product page on Peterson's 300WM Long brass.
"Peterson Cartridge Co. of Pittsburgh, PA announced it is producing .300 Win Mag casings in two versions. Peterson makes the traditional SAAMI spec'd version that headspaces off the belt. But it also makes a version that headspaces off the shoulder. Peterson calls that version the .300 Win Mag- Long."

 

[Bob Wright]

My 7RM generally stretch to the shoulder about .019. After that, bumping back by .002-.003.
It doesn't fully stretch in 1 firing either. It may take 3 firings. But annealing the neck and shoulder makes it very uniform.

 

[ThrdKllr]

I've got some of the 7RM Long brass ordered. The 300WM Long brass I have is top notch. Out of the box it was.002 short to the shoulder of the chamber on my rifle. Most factory ammo is.019 to .022 short in my 7RM. I took some virgin Winchester brass and expanded the necks to.308 and then sized them in my full length die screwed out about 3/8 turn and made them a crush fit and after 3 firings they still don't need trimming. Fire formed in this way, it eliminates the stretch in the body of the case.

 

[Mike D Texas]

I don't know how much "longer" it is if any. But the "long" it is designed to be head spaced off the shoulder instead of the belt.

So the overall length may not be any longer at all.

I believe I read it is .011" longer base to
Shoulder datum.

 

[AntsRick]

I stumbled across this today.

Peterson Brass 7mm Remington Mag Long Unprimed Bulk Box of 250 - Graf & Sons

This is a Bulk package of Peterson Cartridge casings, they will not come in one of their plastic ammo boxes. Made in the U.S.A. Peterson Cartridge Co is committed to producing Match-Grade Brass that enables our customers to get more reloads per casing than industry average. Warning: Only use...

www.grafs.com

View attachment 433562

Thanks for the heads-up! I got a box of 50 7mm RM on order.

 

[martinakl]

Thanks for the heads-up! I got a box of 50 7mm RM on order.

Nice. They only had the 250 count option when I posted. Smaller qualities is a nice option.

Peterson Brass 7mm Remington Mag Long Unprimed Box of 50 - Graf & Sons

All Peterson Cartridge casings come in one of their plastic ammo boxes. Made in the U.S.A. Peterson Cartridge Co is committed to producing Match-Grade Brass that enables our customers to get more reloads per casing than industry average. Warning: Only use Peterson Cartridge Co. casings in...

www.grafs.com

 

[ThrdKllr]

I believe I read it is .011" longer base to
Shoulder datum.

.011 longer than what ? From what I've seen the base to datum length is all over the place depending on brand or even lot numbers. I don't know why ammo, brass and gun mfgs can't get closer on the specs for belted magnums. They do it all the time on the standard cartridges.