Winchester Small Rifle Magnum Primer

Warren Sear · May 20, 2018

Does Winchester make a small rifle magnum primer?

The reason I am asking is that I am going to load some .300 ACC Blackout/Whisper ammo. I want to use Lil' Gun powder. The data I have specifies a Remington small rifle magnum primer. I have Winchester small rifle primers on hand and want to use them.

As far as I know, Winchester has never made small rifle magnum primers (or any other magnum primers) and I know that in regard to hand guns, Winchester primers work for all powders, including ones that require "magnum" primers (such as WW 296). I would imagine the same holds true for rifles, but I want to know if anyone here can tell me if I am right or wrong.

I will much appreciate all informed replies (no guessing, please).

The rifle in question:

Redford · May 20, 2018

Winchester Small Rifle Primers #6-1/2

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Alk8944 · May 20, 2018

Warren, you haven't looked very close! Winchester makes magnum primers in all sizes for metallic loading except Large Pistol.

427mach1 · May 21, 2018

Alk8944 said:
Warren, you haven't looked very close! Winchester makes magnum primers in all sizes for metallic loading except Large Pistol.

From the Winchester website, I don't see any small rifle magnum primers.

SYMBOL PRIMER TYPES
W209 #209 Shotgun Shells
WLP #7 - 111 Large Regular Pistol
WLR #8-1/2 - 120 Large Rifle
WLRM#8-1/2M - 120 Large Rifle Magnum
WSP #1-1/2 - 108 Small Regular Pistol
WSPM#1-1/2M - 108 Small Magnum Pistol
WSR #6-1/2 - 116 Small Rifle

Just another 22 shooter · May 21, 2018

I have used Winchester small rifle primers and Lil gun in my 221 FireBall rifle. worked fine. Don't see why they would be any different in a 30-221 aka 300 blackout/Whisper.

bigedp51 · May 21, 2018

Winchester primers are designed around lighting off harder to ignite Winchester ball powders. So in essence this makes them a magnum primer.

Remington ran the Lake City Army Ammunition plant from 1941 until 1984. And the Remington 7 1/2 and 9 1/2 primers were used to light off Winchester ball powders at Lake City.

Look at the flash photos of primers below, I use the Remington primers for all my ball powder loads.

Primer Flash Test Photos
Primer Flash Test Photos

Below very good info on primers and cup thickness.

CHOOSING THE RIGHT PRIMER - A PRIMER ON PRIMERS
Primer Info & Chart + Milspec Primers for Semi-Autos & Other Primer Applications

And thanks to the Wayback Machine more flash photos and info from Mr. Salazar's shut down website.

A Match Primer Study in the 30-06 Cartridge
By German A. Salazar
The Rifleman's Journal: Primers - Large Rifle Primer Study

A Match Primer Study in the 6BR Cartridge
By Germán A. Salazar
The Rifleman's Journal: Primers - Small Rifle Primer Study

Warren Sear · May 21, 2018

Thanks guys, that confirms my previous understanding. No Winchester small rifle magnum primers are made.

I talked to my local ammo reloading supplier this afternoon. He gave me a funny look and said no one makes magnum small rifle primers except Federal (I think he said), and maybe Remington, but he has not seen, or had any demand, for them. He said Winchester S R primers will git 'er done.

hdwhit · May 21, 2018

Warren Sear wrote:
He gave me a funny look and said no one makes magnum small rifle primers except Federal (I think he said), and maybe Remington,

CCI would be very surprised to learn they don't make magnum small rifle primers. I guess those millions of #450 primers they sell each year didn't meet your reloading guru's expectations.

See: Primer Usage Chart

Warren Sear · May 21, 2018

Oooops, my bad, he did mention CCI SR magnums.

Winchester Small Rifle Magnum Primer

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