CCI BR2 Primers

[Methow Packer]

Has anyone used these for magnum case application. Such as 300 WM. Are they used regularly for large cases? I know they're designed for large rifle standard cases. CCI doesn't make bench rest quality primers for large capacity magnum cartridges?

 

[Jud96]

I use magnum primers in anything I'm using 60+ grains of powder in. No, CCI doesn't make a BR primer for a magnum. I would give standard CCI 250s a test, along with Federal 215 Gold Metal Match primers. I've achieved low SDs and ES numbers with standard Fed 215s, Fed 215Ms, and Remington 9 1/2s in magnum rifles.

 

[lancetkenyon]

I have run CCI BR2 in numerous 28 Noslers, 7RM, 6.5SS, 6.5SAUM using extruded powders. They worked great.

 

[308stillbrass]

Keep in mind that primer cup hardness isn't the only possible problem. If there is too much slop around the firing pin in the bolt face you can very easily get primer cratering that is a false positive for pressure signs. When in essense all you have is an improperly supported primer with pressure against it on one side and no steel supporting it on the back side.
This could be because of a different issue also. Do you use a flashhole deburring tool and open up the flash hole too much allowing more pressure back into the primer cup area? Not a big difference but it does make a difference depending on the case and how big you make the flash hole.
Just some other things to consider rather than simply switching primers until the cratering goes away.

I have several bolt guns that I had a bushing installed into the bolt face to tighten up the slip fit of the firing pin and firing pin hole just for this very reason. It helps cut down on the chances of piercing a primer and getting blow back into your face and eyes.

 

[243winxb]

Ball powder need a magnum primer. I use the BR2 in 243 and 3006. No mags. https://www.shootingtimes.com/editorial/ammunition_st_mamotaip_200909/100079

We tested loads at both maximum normal pressures and at the starting loads (some labs calculate start loads — we shot them). Standard primers caused no ignition issues at the max load but posted higher extreme variations in pressure and velocity in the lower pressure regimes of the start loads. In extreme cases, the start loads produced short delayed firings — probably in the range of 20 to 40 milliseconds but detectible to an experienced ballistician. Switching that propellant to a Magnum primer smoothed out the performance across the useful range of charge weights and completely eliminated the delays.

 

[lancetkenyon]

Keep in mind that primer cup hardness isn't the only possible problem. If there is too much slop around the firing pin in the bolt face you can very easily get primer cratering that is a false positive for pressure signs. When in essense all you have is an improperly supported primer with pressure against it on one side and no steel supporting it on the back side.
This could be because of a different issue also. Do you use a flashhole deburring tool and open up the flash hole too much allowing more pressure back into the primer cup area? Not a big difference but it does make a difference depending on the case and how big you make the flash hole.
Just some other things to consider rather than simply switching primers until the cratering goes away.

I have several bolt guns that I had a bushing installed into the bolt face to tighten up the slip fit of the firing pin and firing pin hole just for this very reason. It helps cut down on the chances of piercing a primer and getting blow back into your face and eyes.

Did I miss a post talking about cratering primers?

 

[johnnyk]

I use them in my .300WinMag, with RL-26 I run 212gn ELD-X's to 3076fps ES of 12, SD of 6.3. That's from a 28", 9t Pac-Nor.

 

[codyadams]

Depends on uses too. I had issues with hangfires in a .270 Sherman using 60.6 grains of rl26 and a 170 EOL going a mild 2850 using BR-2's in low 30's and 20 degree temps. But that was a combo of a slow burning powder that tends to do better with a higher pressure ignition, low case fill, and cold temperatures. I have used BR-2's in 7mm rem mags with success, even in cold temps. But, that was with pretty high case fill of H1000 and Reloder 26, and honestly I prefer to use mag primers, they have not been detrimental to getting consistent velocities, so it takes away any worry of having ignition issues with zero performance penalties.

I'm sure you could use them, probably without any issues, but in a 300 wm, I would personally try to find some Federal GM215M primers, or large rifle magnum gold medal match primers, especially if you hunt in cold conditions. If that isn't an option, try CCI 250's or Federal standard magnum primers. If it doesn't like them, try Remington mag primers....I would be really surprised if you didn't find acceptable performance with any of those.

 

[Methow Packer]

Depends on uses too. I had issues with hangfires in a .270 Sherman using 60.6 grains of rl26 and a 170 EOL going a mild 2850 using BR-2's in low 30's and 20 degree temps. But that was a combo of a slow burning powder that tends to do better with a higher pressure ignition, low case fill, and cold temperatures. I have used BR-2's in 7mm rem mags with success, even in cold temps. But, that was with pretty high case fill of H1000 and Reloder 26, and honestly I prefer to use mag primers, they have not been detrimental to getting consistent velocities, so it takes away any worry of having ignition issues with zero performance penalties.

I'm sure you could use them, probably without any issues, but in a 300 wm, I would personally try to find some Federal GM215M primers, or large rifle magnum gold medal match primers, especially if you hunt in cold conditions. If that isn't an option, try CCI 250's or Federal standard magnum primers. If it doesn't like them, try Remington mag primers....I would be really surprised if you didn't find acceptable performance with any of those.

Good clear answers. Thanks

 

[CatShooter]

Has anyone used these for magnum case application. Such as 300 WM. Are they used regularly for large cases? I know they're designed for large rifle standard cases. CCI doesn't make bench rest quality primers for large capacity magnum cartridges?

I use BR-2 primers in my 300 WIN mag and they work fine.

 

[Methow Packer]

I use BR-2 primers in my 300 WIN mag and they work fine.

I'm buying some to try. I've got a well built 243AI that I'll use them on as well. I'll try them in my 30 Nosler but I'm igniting 80 grains of H1000. I'm using Gold match bench mag primers in it now but a different primer could help tighten groups up.

 

[Jeffrey Van Zandt]

Has anyone used these for magnum case application. Such as 300 WM. Are they used regularly for large cases? I know they're designed for large rifle standard cases. CCI doesn't make bench rest quality primers for large capacity magnum cartridges?

I tried them but there CCI 250LRM primers worked better in my rifle and the mags are better up here do to hunting at -40 temps

 

[CatShooter]

I'm buying some to try. I've got a well built 243AI that I'll use them on as well. I'll try them in my 30 Nosler but I'm igniting 80 grains of H1000. I'm using Gold match bench mag primers in it now but a different primer could help tighten groups up.

My rifle is a 1,200 meter match rifle - it shoots very well.

 

[Methow Packer]

I tried them but there CCI 250LRM primers worked better in my rifle and the mags are better up here do to hunting at -40 temps

Thanks I'll try them too.