In reloading for a Weatherby Mark V 300 magnum. Can I use CCI BR2 primers for this cartridge?
The load is 78.5 Grns of RL22 behind a Nosler Partition.

Yes, per CCI, BR2 primers are not considered magnum primers. Use standard load data.

No. You will not find load data with that powder, using a standard primer in a Weatherby 300 magnum .Data with Fed 215

quote:

Originally posted by 243winxb:
No. You will not find load data with that powder, using a standard primer in a Weatherby 300 magnum .Data with Fed 215

You will if you look on page 382 of Hodgdon's #26 manual. Primer shown for all Wby loads is a large rifle. No mention made of mag primers. Mag primers might work better, but to say no as regards to std primers ain't quite correct. I've loaded more than a few rounds for magnums that supposedly "required" mag primers using standard primers, and they all went bang quite well.

I've been using CCI BR primers in our .300 Win Mags for a long time using H4831 and a 180g NBT with good consistency and accuracy.

Try them out and see if they work for you.

Hodgdon current online data shows a Federal 215 M, click "print" to see data. Current Alliant Powder guide list CCI 250, both magnum primers. Think about this "Free Bore"

Sure, you can load the 300 Wby Mag with CCI BR2 primers, but why?

The BR2 is a great primer but it is designed for things like the 22-250 or 6mm Rem or such.

The Fed 215 line of primers was designed just for the Weatherby cartridges. They work great in Weatherby ammo. If you feel the need to shoot a match type primer shoot the Fed215M, it is a great primer.

The Fed 215M is all I shoot in all my magnum caliber rifles.

The 300 Wby burns lots of powder, as obvious from your load of 78.5 grains of RL 22. You need a lot of spark to set of that much powder, especially in cold temperatures.

quote:

Originally posted by cessna:
In reloading for a Weatherby Mark V 300 magnum. Can I use CCI BR2 primers for this cartridge?
The load is 78.5 Grns of RL22 behind a Nosler Partition.

If you look at most current reloading manual Hodgdon,Barnes,Hornady,Speer,Nolser,Sierra most use Fed 215 mag primer for the Wby.

I've never used a standard primer in a belt case so can not say for sure they wouldn't work but the manual's I load from use them.

that round has been around a lot longer than mag primers have been. does that mean that it didn't go off before?

I wouldn't worry too much. I've never used a magnum primer in anything I have ever loaded. That includes 460 Weatherby, 458 Lott, 338 Win Mag, 500 S&W, 44 Mag and a bunch more.

I also have a friend that uses magnum primers in everything he loads. Don't think it makes that much of a difference. Of course the primer will effect the pressure and velocity of the loads so you should keep that in mind.

Large Rifle Small Rifle

FED 215---large rifle
FED 205

WLRM------large rifle
REM 7 1/2

CCI 250---large rifle
WSRM

REM 9 1/2 M--large rifle
WSR---------small rifle

WLR---------large rifle
CCI BR4----small rifle

FED 210-----large rifle
CCI 400----small rifle

CCI BR2-----large rifle
FED 200----small rifle

CCI 200-----large rifle
REM 6 1/2--small rifle

The BR-2 is not A hot primer for a weatherby 300
stick with the mag. primers
and leave the BR primers to the BR guns

Cessana, I've found that certain powder tend to like certain primers regarless of the caliber you shoot them in.

H4831 seems to like CCI 200, and CCI BR2 primers.

I don't load much RL22, but I've hear good reports with CCI BR2 and Federals with it.

I shoot alot of BR primers in non-BR guns.

quote:

Originally posted by butchloc:
that round has been around a lot longer than mag primers have been. does that mean that it didn't go off before?

Great point, Butch. I've been shooting and reloading for a .264 Winchester, which is very similar to the .257 WBY in terms of powders, bore, and case size, for better than 45 years. Although I have occasionally used "magnum" primers in it, the "go to" load I've been shooting in it for the past 20 years or so has used a "standard" primer. Obviously, it wouldn't be my "go to" load if it exhibited any shortcoming in accuracy, dependability, velocity, or any other issue. Typically, the biggest difference between "magnum" primers and "standard" primers is the label and the price. Numerous tests have shown some brands of "standard" primers to be more "forceful" than some brands of "magnum" primers.

The primer CAN make a difference in load performance; but unless and until you find some shortcoming in your BR2's, by all means give them a try.

quote:

Originally posted by butchloc:
that round has been around a lot longer than mag primers have been. does that mean that it didn't go off before?

Sure no question that early reloading manual didn't list mag primers. Some of the one I use when I first started reloading mid 60's didn't have them listed.

I think we come a long ways since I started reloading as to bullets/primers/powders in that we have more choices.