case stamps = varying case wall thickness?

Rick65Cat

Rick65Cat

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I've tried the search thing and get a bazillion hits..I'll just try here.

I was reading on-line that certain stamped cases have different capacities for powder.
I have a ton of "Winchester .223 Rem" cases, but I discovered some others that are stamped ".223 Rem R P". Does the R P stand for "Remington Peters"? Or is it just a military cartridge? I probably got them when I was picking up range brass.
If its military, do I need to worry about a thicker case wall? I reloaded all the cases ("Winchester" "R P" and "FC") to the specs in my Hornady reloading manual....pushing a 40gr Vmax with 20gr of IMR4198 out of my Remington 700 26" heavy barrel.

Thanks.
 
If you are reloading for accuracy, then you should stick to one brand of brass for a given load. This may not be obvious for new reloaders. As stated different manufacturers of brass have different case volumes, which affect load performance. In addition, some military brass is substantially thicker than its commercial counterpart, and care must be taken when working up a load. As a rough rule of thumb, you need to reduce loads by approx. 5% to maintain chamber pressure.
 
cosmic said:
If you are reloading for accuracy, then you should stick to one brand of brass for a given load. This may not be obvious for new reloaders. As stated different manufacturers of brass have different case volumes, which affect load performance. In addition, some military brass is substantially thicker than its commercial counterpart, and care must be taken when working up a load. As a rough rule of thumb, you need to reduce loads by approx. 5% to maintain chamber pressure.
Click to expand...

Accuracy? Lol,..Yeah, shooting prairie gophers..a target about 2 inches wide by 8 inches tall when standing at about 200 yrds. I need all the help I can get with these eyes. I'll stick with my "Winchester" cases. I have about 500 of those made up.
 
Yes, R-P is Remington-Peters (W-W is Winchester-Western).

A Chronograph comes in handy for this, I'd be leary of mixing headstamps in a small case like the 223. In my experience in larger cases with open sights, 30-30 and up, the Chrono can tell the difference between cases but the target can't.
 
MiG25 said:
Yes, R-P is Remington-Peters (W-W is Winchester-Western).

A Chronograph comes in handy for this, I'd be leary of mixing headstamps in a small case like the 223. In my experience in larger cases with open sights, 30-30 and up, the Chrono can tell the difference between cases but the target can't.
Click to expand...

R-P is commercial, not military.

Sort your brass by headstamp. If accuracy matters, just use the brass you have the most of for accuracy. Trim it all to the same length.

Also, weigh samples of the various brands, and list them, lightest to heaviest. Then, as you load, be aware of the case weight. If you run out of the Winchester brand, move on to the next lightest or next heaviest, rather than a big jump.
 
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