primers, magnum

[wvuredneck09]

I'm exploring BR primers and have almost always used regular plain CCI for all of my various ammo. Is there noticeable difference with the BRs and does anyone make a premium large rifle magnum primer? Loading them for my 7mm WSM and 300 Win. Mag.

 

[TonyR]

I'm exploring BR primers and have almost always used regular plain CCI for all of my various ammo. Is there noticeable difference with the BRs and does anyone make a premium large rifle magnum primer? Loading them for my 7mm WSM and 300 Win. Mag.

Federal makes a Gold Medal Match LR Magnum Primer the GMM215M. I have used CCI BR-2s in cases the sizes you mention because the CCI BR cups are very strong.

 

[wvuredneck09]

What powder are using and what caliber are you comparing these to?

 

[TonyR]

Mostly MRP, H4831, IMR7828SSC, Varget, H4198 and H4350. So far the cases include 7mmRSAUM, 7mm/8X68 RWS, 375 H&H Magnum and 416 Remington Magnum but I am having a 7mm WSM barrel chambered now and a 300 Win Mag to come, all of which will use the same primer.

The 8X68 RWS case has about the same capacity as the 300 WinMag and operates at similar max pressures. The 7mmRSAUM case is rated for more pressure than any of them at 65000 psi and I have tested it to what I believe are those levels with the BR-2. I also use them in my 284 Shehane which is not exactly a Magnum but is loaded very hot by hunting standards.

I tested magnum primers in the 7RSAUM but got better results with the BR-2s. I also weight sort my match primers and the BR-2s average higher weights than the CCI-250 LRM and are much more consistent.

 

[wvuredneck09]

Thanks for the great info, I will have to give them a shot.

 

[maxpower]

Have you experimented with H1000? I was getting occaisional low fliers when using standard BR2 primers in my 7WSM. I am trying CC250s to try to cure the occaisional low shots. Could be a firing pin problem maybe?

 

[TonyR]

Have you experimented with H1000? I was getting occaisional low fliers when using standard BR2 primers in my 7WSM. I am trying CC250s to try to cure the occaisional low shots. Could be a firing pin problem maybe?

I have not tried H1000 but it is on my list to try in the 7WSM. I am new to the WSM/RSAUM cases and have always used RWS and Lapua brass for my other cartridges. I have found some pretty tight flash holes in the Federal, Remington, and Winchester brass I have loaded for friends' hunting rifles. Do you uniform the flash holes in your new brass and stil had ignition issues??

 

[maxpower]

Yes, all flash holes uniformed after the 1st full power firing. I use the Sinclair .082" reamer. The gun shoots very well as a 284, but is no where near as good in the bigger chambering. Same stock, action, scope etc, just different barrels and bolts.
Its interesting what you say about the BR2s being more consistant. I might have a bad batch. I dont normaly weigh primers, never had to, but I started weighing the various large rifle primers a month ago to sort out the accuracy issues, and my Fed215s (not match) are heavier (5.2-5.75)gns than my CCI250s and BR2s (5.15-5.25gns) but not as consistant.

I might have a bad batch or something as I had some issues with them in my 284?????

I will be experimenting with 215Ms as well when work allows to see if it gets rid of the intermitant low fliers.

 

[TonyR]

Yes, all flash holes uniformed after the 1st full power firing. I use the Sinclair .082" reamer. The gun shoots very well as a 284, but is no where near as good in the bigger chambering. Same stock, action, scope etc, just different barrels and bolts.
Its interesting what you say about the BR2s being more consistant. I might have a bad batch. I dont normaly weigh primers, never had to, but I started weighing the various large rifle primers a month ago to sort out the accuracy issues, and my BR2s are heavier (5.2-5.75)gns than my CCI250s (5.15-5.25gns) but not as consistant.

I might have a bad batch or something as I had some issues with them in my 284?????

I will be experimenting with 215Ms as well when work allows to see if it gets rid of the intermitant low fliers.

I hope I can get one of the short magnums to shoot as well as my 284 Shehane. The 284 is a great match cartridge.

I started to sort primers just to test the weight of propellant in them to see if I could correlate that with anything else I could measure. Surprisingly, almost every package of 100 would have one that would weigh the same as a the average fired primer. I have saved those light ones and I will run a test when I have enough to get some meaningful results. I have never had a misfire with weight sorted primers but I have had a couple where I haven't weighed the primers. I can't prove that weighing them actually does any measurable good but it does give me confidence on the line which makes it worthwhile for me.

 

[k80skeet]

I have had my best luck with Federal 215M (Match) with both my 300 WSM with 65.5 H4831 180gr Sierra Match King and in my 300 Winchester Mag 72.0gr H4831 178 gr Hornady "A" Max.

 

[maxpower]

K80Skeet.
Did you experiment with different primers in your two 300 magnums?
What did you find over the crono?

 

[wvuredneck09]

what about cup hardness on the federals?

 

[expiper]

Maxpower....are you using 215's or some other Magnum primer in your .284??....this could be what is causing your flyers...tooo much primer force???...Roger

 

[wvuredneck09]

there are a few pending questions that interest me so for sake of hopefully gaining a little more knowledge I'm hoping to bump this topic back to life. BTT!!!!!!!

 

[maxpower]

In my 284 I am using either CCI BR2s (old lot working well) or Wolf/Tula LRs. I have not had issues with fliers in the 284. The new WSM though is a different matter. I have now played with a few different magnum primers, but still get the fliers. It is obviously a sick barrel and not primers as I thought. My cronograph has a new unwanted hole in it so I cant use it to check spreads, but I get the same moa low fliers whether it is 600 or 1000yds.