Remington 7 1/2 on 30BR

[TommyD11730]

Ok.. so Im just about out of my CCI BR primers for my 30BR. I do have (by my standards) a nice cash of the Remington 7 1/2s.
From the fellows who have shot both how much of a decrease in velocity should I expect?
Right now I'm seeing an avg for 2988 on Berger 115s with 34.72g of N130.

Thanks guys!

 

[Bill Norris]

Ok.. so Im just about out of my CCI BR primers for my 30BR. I do have (by my standards) a nice cash of the Remington 7 1/2s.
From the fellows who have shot both how much of a decrease in velocity should I expect?
Right now I'm seeing an avg for 2988 on Berger 115s with 34.72g of N130.

Thanks guys!

You may not see any drop at all. You may even see a gain. I would test the powder again with the Rem 7 1/2.

 

[Shifty6br]

Primer Flash Test Photos

6mmBR.com is the best guide for 6mm BR Benchrest precision shooting, complete with 6BR FAQ, Reloading Data, Shooter Message Boards, Reader Polls, and Photo Gallery. Match event calendar and rifle competition accuracy training tips. Equipment reviews (.243 bullets, 30BR cartridge, 6mm Norma...

www.6mmbr.com

 

[BRGUY]

I spoke with Jim Stekyl @ Remington some 30 years ago, and he told me that the Remington 7 1/2 primer was considered to be a "Magnum Match" primer and depending on things like cartridge, caliber, barrel length, etc., velocity can increase over a standard primer by as much as 20 - 150 fps..

Jim was a Bench Rest shooter, so I took him at his word and what he said was very true!

 

[6BRA]

The flame of a 7.5 is pretty large!

 

[7887mm08]

The flame of a 7.5 is pretty large!

Is that good or bad?

 

[Bob3700]

Do a search of the Precision Shooting archive and look for German Salazar’s review of various primers. The test fired many different brands of LR n SR primers in a short bbl and photographed the flash of each primer. The REM 71/2’s were one of the more powerful SR primers.

 

[6BRA]

Is that good or bad?

If your gun likes it, it is good.

 

[Ackman]

Ok.. so Im just about out of my CCI BR primers for my 30BR. I do have (by my standards) a nice cash of the Remington 7 1/2s.
From the fellows who have shot both how much of a decrease in velocity should I expect?
Right now I'm seeing an avg for 2988 on Berger 115s with 34.72g of N130.

Thanks guys!

Here's a thought......try some 7-1/2s and find out.

 

[17VLD]

I actually had a small increase with 7 1/2s from CCI 450s in my Dasher and they survive pressure very well too.

 

[AlNyhus]

Primers are one of those things that we just have to try to find out.

It's been a few years but the 7 1/2's in one of my 30BR's gave the same accuracy as the 205/205M's I normally use. Same thing with the WSR's.

Good shootin' -Al

 

[JEFFPPC]

Tune with the Rems. Velocity will be what it will be. If that's confusing throw the crony away and look at the targets. Less confusing.

 

[Pete Wass]

I recently got a bad batch of Winchester SR's at Cabelas so I bought Rem 7.5's the next time through. So far, all of them have gone bang. I don't concern myself with 100 or so FPS. That wont help anything in a bad windflag read . The smallest hole in a fairly flat node; now that's what one should strive to find.

 

[Laurie]

I actually had a small increase with 7 1/2s from CCI 450s in my Dasher and they survive pressure very well too.

I did a Small Rifle Primer comparative test in 308 Win SRP Palma brass some years ago, and found this too. 30BR may reverse that of course, and primers are frequently lot-sensitive too (especially recently during times of severe shortages). As others have said, you'll find out when you try them ......... and retune your load if need be.

https://www.targetshooter.co.uk/?p=2662

 

[TommyD11730]

Today I fired 10 rounds with 7 1/2s vs CCI BR. The AVG was 2995 vs 2999 for the CCI BRs.

YMMV.

 

[TommyD11730]

So I figured I was done with this thread, but I thought I would add just one more post.

When I decapped the brass last night I noticed something. The 10 pieces that had the 7 1/2 primers were very tight to remove. I use a hand tool and it took every bit of 2 hands strength to remove them.
All the cases had been uniformed with the sinclair tool prior to loading. Same goes for the flash holes with the 21st century tool.

When priming by hand the 7 1/2 felt no tighter then the CCI.

This could be a nothing burger. I just wanted to mention it.

 

[Kracken McGraw]

So I figured I was done with this thread, but I thought I would add just one more post.

When I decapped the brass last night I noticed something. The 10 pieces that had the 7 1/2 primers were very tight to remove. I use a hand tool and it took every bit of 2 hands strength to remove them.
All the cases had been uniformed with the sinclair tool prior to loading. Same goes for the flash holes with the 21st century tool.

When priming by hand the 7 1/2 felt no tighter then the CCI.

This could be a nothing burger. I just wanted to mention it.

Accuracy difference between the two?

 

[TommyD11730]

Accuracy difference between the two?

Not much. Im loading up 50 more to test.

 

[boltfluter]

Not much. Im loading up 50 more to test.

The .30BR continues to amaze me with it's inherent accuracy. I do not need one, I do not need one!
Paul