A 52 FPS difference between a Win WSR primer and Rem 7 1/2 primer. (??)

Beware CCI-400's

In one of my experiments with small rifle primers, I tried CCI-400's in various rifles chambered in 6PPC and .223AI. It was winter in Arizona and all of my shooting was in temperatures less than 80 degrees. Some of my favorite loads for both chamberings shot very well for a few of the cooler months.

In May when daytime temps began to spike into the 90's I began to have problems with deeply cratered primers which, within a couple hours, led to pierced primers. That particular day I was shooting a 6PPC with a new barrel. Initially, I didn't suspect primers as the load had been shooting well in previous months.

The following week I was at the range with a Remington 700 in .223AI setting up to shoot rounds primed with CCI-400s. First round out of the barrel took out extractor, ejector plunger spring and trigger as a result of a pierced primer. This was a load I had been using for years with Remington 7 1/2 primers.

With a little research I found that CCI-400 primers have thinner cups than CCI-450 and CCI-BR4 primers. I knew 7 1/2's had thick cups but didn't do my homework on CCI-400's. Evidently, that primer is designed for low intensity rounds like the .22 Hornet and others with similar capacity. I changed back to 7 1/2's in my .223AI's and WSR's in PPC's and all was well again.
 
I agree I would not use the CCI 400 and that is why I didn't list them.
My records show WSR--> CCI400--> CCIBR4-->CCI#41 hottest to coldest BY CHRONO.

I had way more primer problems with the WSRs (a fair number of pierced or blown) and CCI400s (a few blown) than with CCI#41 (or CCIBR4s). Actually, I've never had any problem with either the CCI#41 or CCIBR4s in my AR15s. I've never tried the CCI450s but the are supposed to be the same as the CCI#41s.

This taught me very quickly (as it was the first gun I learned to reload for) that primers really are NOT interchangeable!
 
Gerry said:
WOW i'm getting old That was a very long time ago
I wonder how many guys are still around that read that"???
Click to expand...
Gerry,

Not so long ago if I can remember it. :D

Was that the one that they ran a couple of wraps of tape round the rod to give it a seal & minimal bearing surface?

It can't have been G & A - they were never technical enough for that - too interested in .333s. Must have been G & G or one of the other pretenders.

John
 
VaniB,

The pic shows the results of blown primers. These primers were not pierced, they leaked severely due to overpressure.
 
My experience with Remington 7 & 1/2 primers is that they are the toughest when it comes to resisting gas leakage. It always was the best in my .17's.
 
A 52 fps

John I doubt Guns and ammo.
Maybe Rifle Magizine , Remember that one?
I'm pretty sure P and S though.
Over the hill Gerry
 
Butch Lambert said:
VaniB,
For a guy that won't go to a match, he sure knows how to bee really sweat to a person asking a question.
Butch
Click to expand...


so butch,
just to stir the pot a little,
what does his 16" short stock ar have do do with BENCHREST shooting ?

and since it aint, what disqualifies me from commenting on ar's...a field i do know both as shoulder rifles and benchrest ?

ohh and both in matches......

mike in co
 
wolf primers

Gene
Which small Wolf primers did you find the most accurate, the Regular or the Magnum?
Sorry dont mean to hijack the thread, but there is a opportunity to learn a bit here.
Kim
 
Fixinit said:
Gene
Which small Wolf primers did you find the most accurate, the Regular or the Magnum?
Sorry dont mean to hijack the thread, but there is a opportunity to learn a bit here.
Kim
Click to expand...

ya cannot quote me, but the only thing i have heard mentioned in br or BR, has been the srm or its early version in pmc....all from the same factory.
 
A 52 fps

So Far the wolf Mag primers have ben the best.
From the write ups from other guys , basicly the compound is the same amount in both , The only differance is the primer cup.
John maybe Gun digest years ago.
They use to have some of the same writers at times.
I remember the black and white photos and the rod measurments.
I have memories of a rifle in a vise and someone taking measurments with a rule at the muzzel. { realy scientific } for the times. chuckels
The write up was very good as i remember.
CCI BR4 were pretty new at the time. Most people were shooting the Remington 7 1/2. Some winchesters . The 6 1/2 had a soft thin cup and would pierce. The 7 1/2 and the then new CCI br 4 were the ones most were using. Hot loads in the duce''
 
Fixinit said:
Gene
Which small Wolf primers did you find the most accurate, the Regular or the Magnum?
Sorry dont mean to hijack the thread, but there is a opportunity to learn a bit here.
Kim
Click to expand...


Kim, I have used only the SRM Wolf primer. I have been told by reliable sources that the only difference is the SRM has a harder cup.
 
I'm new to benchrest, and more of a student than anything else. But I have been loading wildcats and odd calibers in guns that have little to no load info for quite a few years now. I am not saying without proof that this was the cause but, I have run into case capasity and powders, that will suddenly cause pressures to spike. I could see how a primer change could result in more pressure, it's happened to me a few times looking for a load with wildcats.
Kim
 
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