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 S&B SR Primers and the M1 Carbine
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daboone
Junior Member


USA
86 Posts

Posted - 10/01/2018 :  09:22:45 AM  Show Profile Send daboone a Private Message  Reply with Quote
Anybody used S&B SR primers for the M1 Carbine?

I do my primer pocket uniforming with Sinclair's primer pocket uniformer. I use this tool on the RCBS case prep center or with a hand drill until this uniformer bottoms out (no more brass shaving are seen). Even on the "treated" cases these S&B SR primer sit slightly proud/flush to the case head. Wolf, Winchester, and CCI all seat perfectly with or without using the uniformer.

Tuna
Moderator



3325 Posts

Posted - 10/01/2018 :  11:19:07 AM  Show Profile Send Tuna a Private Message  Reply with Quote
I know S&B are well known for having shallow primer pockets on quite a few of the rifle rounds like 7.62x54, .303 British and I think 8x57 Mauser were some of them. I have not heard of their primers being overly long though.

Edited by - Tuna on 10/01/2018 8:28:19 PM
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johniv
Greenhorn Member



USA
37 Posts

Posted - 10/01/2018 :  2:16:13 PM  Show Profile Send johniv a Private Message  Reply with Quote
I have not noticed any problems with S&B primers (and I have just used a few) but I was using them in .38 Spl. brass.
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Tuna
Moderator



3325 Posts

Posted - 10/01/2018 :  8:30:50 PM  Show Profile Send Tuna a Private Message  Reply with Quote
Winchester has had S&B make some of their ammo for them and I think they had some runs of primers made too. If your using a brass colored primer from Winchester then it very well may be made for them by S&B.
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daboone
Junior Member



USA
86 Posts

Posted - 10/02/2018 :  08:03:58 AM  Show Profile Send daboone a Private Message  Reply with Quote
This SAAMI diagram You must be logged in to see this link. states at the bottom "Primer to be seated flush to 0.008" below face of cartridge case head" I've shied away from flush because of my obsession with milsurps and free floating firing pins. These S&B primers were mostly flush, so according to SAAMI, maybe I'm just overly cautious?
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Tuna
Moderator



3325 Posts

Posted - 10/02/2018 :  10:47:16 AM  Show Profile Send Tuna a Private Message  Reply with Quote
I don't think you are. Your being cautious and with military surplus firearms it's better to seat them below flush. It can sure cut down on slam fires in my opinion.
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jimb16
Moderator



USA
3159 Posts

Posted - 10/02/2018 :  8:10:27 PM  Show Profile Send jimb16 a Private Message  Reply with Quote
Free floating firing pins don't have enough mass to cause slam fires. Worst case is a tiny ding in the primer. As long as the primers are flush you are good to go. I've used all kinds of primers in my reloads and never had any problem; not even with soft primers. The only way they can cause a problem is if they get stuck forward in the channel and as long as you keep the bolts clean, that is extremely unlikely to happen.

OGCA Lifer,NRA Life member, son of a 325th GIR Glider Rider
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Pappy
Advanced Member



319 Posts

Posted - 11/03/2018 :  09:22:29 AM  Show Profile Send Pappy a Private Message  Reply with Quote
I've used S&B primers with no problems and usually cheaper than other brands.

OGCA Life Member, NRA, GCA,
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Pappy
Advanced Member



319 Posts

Posted - 11/03/2018 :  09:24:06 AM  Show Profile Send Pappy a Private Message  Reply with Quote
I've used S&B primers with no problems and usually cheaper than other brands.

OGCA Life Member, NRA, GCA,
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COSteve
Advanced Member



USA
102 Posts

Posted - 11/10/2018 :  5:59:51 PM  Show Profile Send COSteve a Private Message  Reply with Quote
I had some issues with S&B primers some 10 yrs ago so I haven't tried them since. A handloading buddy uses them now and so far he's satisfied with them. When I need a new batch, I may give them a look.

Steve

“Remember, no matter where you go, there you are.” - Confucius
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