Is there any other difference between a
Rem 6 1/2 and 7 1/2 besides cup thickness??
I was thinkin of working up a 223 load on the
6 1/2's because they should show psi better than a small case would?????? Anyone try this yet?????

No. Haven't tried it. Primer appearance is not a particularly good means of "reading" chamber pressures. I would not bother to do this unless I just happened to have a lot of those primers laying around that I wanted to use up. I doubt there's much difference in the "hotness" of the two types.

[ 11-25-2003, 16:33: Message edited by: eldeguello ]

The 7 1/2 is Remingtons small rifle match primer.
It's all I use for .223 match rounds. Very consistent. The cost difference where I live is virtually nothing. The actual difference is negligeable, just more inspection during the production process from what i've been told.
Covey

I had an old Hornet and it went away and I have a few hundred primers that need a use other than a laugh in the burn barrel.
And when I read that the cups were thinner I thought I would use them to work up loads because a 335 case head is so small it dosen't show psi very well. As you will guess I run my stuff a little on the warm side but I've been doin this for awhile and there is a big dif... between HOT and warm!! I remember a time before chronographs and some real excitement used to happen once in a while..
AHH!! The good ole days!!!

Hey stevozrex,
It's my understanding that the Remington 7 1/2s were developed for the M16/AR15 family of rifles to prevent slam fires from occurring due to their inertial type firing pins.

I had a bunch left over from a Hornet and tried them in my 223. I use H335 and it would do a funny thing. Some rounds, maybe 3 in 10 would hang fire. Pull the trigger and it would take 1/2 to 1 second before it would go off. Not all, but it was disconcerting to say the least. They didn't do it in the hornet.
David