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Remington 7 1/2 bench rest primers?

Straightshooter1 said:
I started using the 7 1/2's about a year ago and found they've produced excellent results out of my .308. I'd say, base on my limited experience, they're as good as any other out there and think you should not hesitate to try them.

I was actually surprised by such good results as I had previously tried the 9 1/2's and they produced awful results with loads that should have been good.

PS: Their diameter is a hair larger than others, which can be an issue when seating into tight pockets like one finds with Alpha brass. But if your pockets are running a little loose, these are a good one to use to tighten things up a little.
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7-1/2's in a .308????
 
Remington 7 1/2's were designed for the 5.56 and have a thicker cup than, say, the 6 1/2 primer which is made for lower pressure loads. I've used many thousands of 7 1/2's in my service rifle loads. They work well in all 6 of my .223 rifles. I've used them also in SRP Lapua and Peterson 6mmCM loads and they work as well as 450's.
 
Just a little history regarding the Remington 7 1/2 primer. The 7 1/2 primer was introduced 1965 for use in the 221 Fireball cartridge that ran at a higher MAP than the 222. It's thicker cup resisted the higher pressures of the 221 Fireball and also the higher pressures encountered when running the 222 at max speed. Later in 1978 it was used in the introduction of the 22 BR. In my high pressure cartridges it renders best extreme spreads and ignites ball powders well.
 
Over the years, I have found primer preference to be rifle specific. In other words, a particular rifle would prefer a particular primer, regardless of the powder used or other component changes. Further, a particular action would show this preference regardless of barrel or chambering. This led me to think the preference was related to striker energy and/or firing pin shape etc.
So it was that a 40X showed a marked preference for CCI BR's, a Shilen DGA liked 205's, and a Wichita liked Remington 7 1/2's. If I wanted to double group size in the 40X, all I had to do was load 205's in it. If I wanted to see more flyers from the Wichita, CCI's were my huckleberry.
For this reason, when I am working up a load, I always check the effect of primer choice as part of the process. WH
 
I started using the 7 1/2's for my A/R's around 15-20 years ago and have shot tens of thousands of them with no complaints. As Lcazador mentioned, they do work great with ball powder. I've run a lot of W748 in my varmint loads in .223. As for accuracy and SD's, etc., it is best to run your load with a few different primers to find what works best for a given load, but in general - the 7 1/2's will do what you want most of the time. They are very sturdy primers and greatly resist piercing and leakage around the edges under pressure, as do the 450's, etc.. They are somewhat similar to the Russian (Tula and Wolf) primers we used to be able to get in respect to tight fit in the pocket (though not quite as tight). Great value in today's primer world.
 
searcher said:
I started using the 7 1/2's for my A/R's around 15-20 years ago and have shot tens of thousands of them with no complaints. As Lcazador mentioned, they do work great with ball powder. I've run a lot of W748 in my varmint loads in .223. As for accuracy and SD's, etc., it is best to run your load with a few different primers to find what works best for a given load, but in general - the 7 1/2's will do what you want most of the time. They are very sturdy primers and greatly resist piercing and leakage around the edges under pressure, as do the 450's, etc.. They are somewhat similar to the Russian (Tula and Wolf) primers we used to be able to get in respect to tight fit in the pocket (though not quite as tight). Great value in today's primer world.
Click to expand...
They definitely give a tighter fit along with all the other positive assets.
 
Coyotefurharvester said:
And the small sleeve is easy to dump into my Lee primer, I hate the larger packaging of some brands.
Click to expand...
LOL… I thought I was the only one. I use Federal 205M’s in my 30BR and haaaate the oversized Federal boxes.

FWIW, I have always had good luck with Remington 7-1/2’s, particularly in .223 and 6x45, but was worried about consistent availability when working up a load for 30BR.
 
7-1/2 was all I used at one time in small rifle brass. I found 7-1/2, CCI 41, 450 all the same in accuracy. Like Straight shooter 7-1/2 is a bit harder to seat in some brass. The plated primers like CCI 450 are a bit easier to seat. Priming 50-100 cases I now use the Lee auto bench priming tool so tight primers don't wear out my hand anymore.
 
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