New Lapua .308 small primer pocket idea

Verminator2

Active member
I was just looking in the new edition of Precision Shooting, and saw that Lapua is now making .308 brass with the small rifle primer pocket. The first thing that jumped into my head was .243 AI Lapua cases with a small rifle primer... awesome. I'm not sure how necking it down will work. I'm kinda worried about a doughnut because of the thicker brass, and any other problems caused by the change in pocket size. So what do you all think?
 
Actually, this is nothing new. Remington used to sell BR brass around 30 years ago that was nothing more than .308 brass with a small primer. I used to buy it for necking down in my 7mm-08 XP100 for use in IHMSA matches. But what it was really made for were for those folks that wanted to resize it for .22BR, 6mmBR an 7mmBR brass, which at that time was not made for each caliber.
 
Jim Carmichael used the Rem URBR brass to make the "22 Cheetah". IIRC many folks had ignition problems with the small primers and that much powder, especially in cold weather.
 
Both guys are right, not so new by any means..the small primers they say, burn a little more consistant...Not for the average shooter or hunter..it's more for those benchresters.
 
After seeing a hunting partner have hang fires and no fires on many rounds using 42.0g of IMR 4064 with a 52g Sierra in a 22 Cheetah, I'll pass on the whole small primer deal. We were shooting grounds squirrels in 65* temps. He was using Rem 7 1/2 primers.

I have shot large rifle primers in 6PPC cases made from PMC brand of 7.62x39 Brass. Accuracy is astounding to say the least with the large rifle primers. Problem is that PMC 7.62x39 brass is the only brass that is "tough" in this caliber to make the PPC cases.
 
Originally Posted By: ackleymanAfter seeing a hunting partner have hang fires and no fires on many rounds using 42.0g of IMR 4064 with a 52g Sierra in a 22 Cheetah, I'll pass on the whole small primer deal. We were shooting grounds squirrels in 65* temps. He was using Rem 7 1/2 primers

I would think that this would me more of a firing pin problem, primer seating depth problem, or cup thickness or a combination thereof, before I would think that a 7 1/2 simply would not ignite said powder column.......
 
"I would think that this would me more of a firing pin problem, primer seating depth problem, or cup thickness or a combination thereof, before I would think that a 7 1/2 simply would not ignite said powder column......."

+1

Jack
 
Here is the last time we touched on this:
PM link

I do think, I am going to purchase some more and give it a try. There are a wide variety of "easy to light" powders now and the long hot burn of the Russian primers may just work.
John
 
Originally Posted By: RustydustActually, this is nothing new. Remington used to sell BR brass around 30 years ago that was nothing more than .308 brass with a small primer. I used to buy it for necking down in my 7mm-08 XP100 for use in IHMSA matches. But what it was really made for were for those folks that wanted to resize it for .22BR, 6mmBR an 7mmBR brass, which at that time was not made for each caliber.

Not quite true, the Rem .308 BR brass was also much lighter(thinner walls) than regular .308 brass, easier to reform, plus you get a little more powder capacity. I have a rifle in 7mm "TnT" and use the BR brass in it and have no problems with primers igniting the powder.

Ole
 
I've seen enough 30BRs and more recently, 6.5x47 Lapuas, fire up with not troubles. Never seen em do it in Dec, Jan, or Feb, though. This is when I'd be worried about it. Certainly no need for a smaller primer/flash hole in any type of hunting rig.......
 
Originally Posted By: EddieHarrenWhat is the case capacity of the 7MM TNT?

Can't honestly say, I never checked, will have to do that once. I can tell you that 42.5grs of VV N-540 will push a 130gr SMK to 2945-19-7 over my Oehler 35P with excellent accuracy. I have run some slower powders up to 43grs, but they're to slow in this case.

Ole
 
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Ole, I used the Rem URBR, for 3 or 4 years, shortened up by .200". I called it the "30 Doggie" but I think someone else had already done that name on a different case length. I used it in IBS Hunter score matches. I shot a case full of H4895 and 125 gr. bullets. I never had any failures to ignite. When I used the URBR brass for a Cheetah, I had ignition problems in cold weather. I think the "fine line" as far as ignition, with the small primer, lies between these 2 case capacities.
 


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