Small rifle primers????

26 November 2003, 00:21

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?????

26 November 2003, 01:32

<eldeguello>

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 ]

26 November 2003, 04:13

covey16

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

26 November 2003, 06:13

stevozrex

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!!!

26 November 2003, 09:48

Bigdaddytacp

quote:
Originally posted by stevozrex:
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?????

The 6 1/2 are not for the high pressure rounds and in a normally loaded 223 round will split the sides of the primer and erode the bolt face and allow gas to escape into the action....this from Remington and personal experience!!!!! They work well in Hornet/30 Carbine and similar loadings and after that its a might/might not split and let gas explode out the primer pocket!!!!The 7 1/2 work well as does Federal standard and BR primers......in a gas gun I don't know how they would react but the story is that it is why the 7 1/2's were made for the M16 loads in 223......good luck and good shooting-loading!!!! don't forget the shooting safety glasses!!!!!!

27 November 2003, 02:18

WhiteRook

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.

27 November 2003, 14:22

stronics

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