Which Primer for my .300 Win Mag Load?

[mdslammer]

Hi Guys,

Just got my Remington 700 .300 Win Mag. I want to start my load development.
I will be using some Federal once fired brass, Berger 185 gr. Juggernauts bullets,
Hodgdon H-1000 powder.

I have both Federal Large Rifle Match 210M and Large Magnum Rifle 215M primers as well as CCI 250 primers.

Which do you recommend I use?

Thanks.

MDslammer

 

[MTBULLET]

what your load book recommends

 

[smokeumm]

I would only use large magnum primers.

 

[mdslammer]

what your load book recommends

I've already checked. It was the first thing I did.

The Berger Reloading Manual, 1st edition does not list any primer recommendations for the 185gr. Match Juggernaut Target. Only Start load, Start Vel. Max load, Max Vel. & Fill Ratio.

Thanks anyway.

 

[MudRunner2005]

Here's a good rule of thumb to use...

If the cartridge uses a "magnum" bolt face, most likely it's a magnum....So use a Large Rifle Magnum primer.

If it's is a .30-06/270/280/25-06/308/243/22-250 (or anything else based on a "standard" bolt face, then use a regular Large Rifle primer.

And use Small Rifle primers for .223/5.56/.300 Blackout size cases.

 

[mdslammer]

I would only use large magnum primers.

Well, that's what I was thinking to. Either the Federal 215M or the CCI 250.
I read on a couple of other forums some guys were trying the Federal 210M
which seemed odd not being a magnum primer.

Thanks for posting smokeumm.

 

[mdslammer]

Here's a good rule of thumb to use...

If the cartridge has a case larger than a .30-06, most likely it's a magnum....So use a Large Rifle Magnum primer.

If it's is a .30-06 sized case, or smaller, use a regular Large Rifle primer.

And use Small Rifle primers for .223/5.56/.300 Blackout size cases.

Hmmm. Good to know MudRunner2005. Thanks.

So would I be correct in assuming that the Federal 210M and the Federal 215M are both the same diameter but the difference being in the charge and it's intent or use?

 

[MudRunner2005]

Hmmm. Good to know MudRunner2005. Thanks.

So would I be correct in assuming that the Federal 210M and the Federal 215M are both the same diameter but the difference being in the charge and it's intent?

Yes, you are correct. And using a magnum primer in an already hot load in a standard cartridge can be catostrophic.

 

[FEENIX]

 

[gohring3006]

I worked up a load with fed 215s in my 06 with 200gr smks and imr 4350 I didn't notice any difference in accuracy I just did it because it was the only primers I could find at the time but I worked up to my load checking for pressure and I found one that was perfect so I'm going to continue to load it but I don't load any standard primers in mag cases to much powder to ignite

 

[MudRunner2005]

I worked up a load with fed 215s in my 06 with 200gr smks and imr 4350 I didn't notice any difference in accuracy I just did it because it was the only primers I could find at the time but I worked up to my load checking for pressure and I found one that was perfect so I'm going to continue to load it but I don't load any standard primers in mag cases to much powder to ignite

As long as you work up with that primer, you're fine...But if I took my already established load for my '06 AI, of 61.5gr of 7828 SSC with a Fed 210 primer....Then decided to willy-nilly stick in a Fed 215 Magnum primer in there, that would be BAD!

 

[RT2506]

The Fed 215 is a bit hotter primer than the CCI 250 but either will do fine AS LONG AS YOU ARE STARTING LOW AND WORKING UP WITH THE POWDER. This is also true with using mag primers in smaller cases. Most ball powders recommend using mag primers. My pet 25-06 deer load uses CCI 250 with IMR 4350.

 

[Lefty7mmstw]

A lot of us up north hardly use standard large rifle primers unless we are lighting rather small charges of powder, like in a 243 or 22-250. When I've got a 5x5 buck in my scope and it's -20 f outside, I'm not needing a mild primer causing problems with a delayed fire because I'm lighting 100 grains of slow burning powder. I'll develop the load with the mag. primer and take a variable out of the equation.

 

[gohring3006]

As long as you work up with that primer, you're fine...But if I took my already established load for my '06 AI, of 61.5gr of 7828 SSC with a Fed 210 primer....Then decided to willy-nilly stick in a Fed 215 Magnum primer in there, that would be BAD!

I started a thread awhile back about mag primers in 3006 and I took your advice about working up with fed215s I'm pretty sure it was you maybe not but I think it was and your right I never change any component without working back up