Home Forums Reloading Big Game Rifles Opinions on Winchester Large Rifle Magnum Primers

Thier cups are somewhat harder as they dont flatten out as much as Federals.

I used them to shoot this 3-shot group last week (100 yds), 7 WSM, 160 NAB, 48.5 grains I-4831.

Hi guys, what do you think about the Winchester large rifle magnum primers. They are having a good sale on them at Midway. The price has me interested, let me know what you think. Thanks, BSA.

I mostly use Fed 215s but in my heavy-barreled M-70 Laredo .300 Win Mag, I use Winchester Large Rifle Magnum primers.

Listed below is a handy chart which I found some years ago.

Ranked in order of power
Large Rifle = LR, Large Rifle Magnum = LRM, Large pistol =LP,�
Brand/type��������������� Power Average����������� Range����������� Std. Dev
1 Fed Match GM215M������� 6.12�������������� 5.23-6.8�������������� .351
2 Federal 215 LRM������������ 5.69��������������� 5.2-6.5��������������� .4437
3 CCI 250 LRM����������������� 5.66�������������� 4.5-7.4���������������� .4832
4�Winchester WLRM���� �����5.45��������������� 5.1-6.0��������������� .2046
5 Remington 9 1/2 LRM����� 5.09��������������� 3.5-6.75������������� .6641
6 Winchester WLR������������� 4.8���������������� 4.1-6.0��������������� .4300
7 Remington 9 1/2 LR��������� 4.75�������������� 3.7-6.25������������� .5679
8 Fed Match GM210M�������� 4.64�������������� 4.0-5.6��������������� .3296
9 Federal 210 LR����������������� 4.62�������������� 3.7-5.5�������������� .3997
10 CCI BR2������������������������ 4.37�������������� 4.0-5.0�������������� .2460
11 CCI 200 LR�������������������� 4.28�������������� 3.8-4.8�������������� .3218
12 KVB 7 LR Russian���������� 4.27�������������� 3.8-4.8�������������� .2213
13 Rem 91/2 (30 yrs old)������ 4.16��������������� 3.8-4.8������������� .3427

Pistol primers
14 Rem LP��������������������������� 4.47��������������� 3.2-5.6��������������� .5171
15 KVB 45 LP Russian��������� 3.89��������������� 3.3-4.2��������������� .2232
16 CCI 300 LP��������������������� 3.18��������������� 2.7-3.5��������������� .2406
17 Federal 150 LP���������������� 3.11��������������� 2.6-3.5��������������� .2090
18 Fed Match GM150M������� 3.05��������������� 2.6-3.7��������������� .2299

This is a retype after losing the original web page.� I did not put in the individual comments.� Note the spreads.� The Rem's had some very wild shots high and low.� CCI BR2 and the Fed 's were the most even of the common ones.� The new Russian were very even, but this was a limited lot and they are not widely available.
Weighing Primers: I did some test weighing and found the bench rest had virtually no variations.� Of the others, there WAS a relation between weight and power.� Those extra heavy tended to be stronger, and light were weaker.
Firing pin strength also seems to be a definite factor. Stronger hit is probably more consistent.� This has been noted by some sharps shooters when they break a firing pin.� It will still fire, but they get fliers and open groups.�
The pressure used to seat primers, pocket uniforming, flash hole uniforming, and seating depth are all factors.� Keep them all the same.
Another thing that is not in this test, but I have noted, is using a newsprint wad over the primer.� This keeps grains of powder out of the flash hole.� It seems to even out the ignition by eliminating a variable (sometimes with grains in and sometimes without grains in, or a variety of combinations).