7MM rem mag and federal LR primers?

[Brianma65]

Hello, I have a Rem 7MM magnum and Retumbo powder. It says to use CCI 250 primers in my Speer manual and Winchester WLRM in my Hornady book. I have Federal 210 LRP only, at this time. I'm pretty sure I can use these but not sure what I'm giving up. I've read that I'll lose some velocity but may gain in accuracy. If that's the case , then I'm ok with that. What say you?

 

[stubblejumper]

I would not trust a big game hunt to Retumbo in the 7mmremmag in cold weather with 210 primers.

 

[Brianma65]

Is It the Retumbo? The primers ? Or both? ( Retumbo was the only thing available locally ).

 

[Brianma65]

I've been reading my 2 manuals and looking at Barnes and Nosler reloading data. I've cross referenced all the powder listed from these 4 different data sources and came up with IMR 7828 and 4831. These two are listed on all 4 data options. I'll try one of those and maybe scrap the LRP idea.

 

[rokoro]

Brian Slow burning powders in cold weather in large capacity cases need a hot primer to ensure consistant ignition. I would have to agree with Stubblejumper. You need a hotter primer.

 

[Brianma65]

Thanks guys , I'll go with the LMP.

 

[Kevlak]

I use what I can find for magnum primers, whether it be fed215/m, cci 250s or rem 9 1/2. Try and stick with magnum primers for magnum cartridges, they will also work in place of large rifle primers in smaller cartridges, like the 308.

Kevin

 

[hoytcanon]

That is a stocky powder column to consistently ignite with LR primers... I would find some 215's or 250's... and try to get your hands on some RL-26... try Rusty Wood Trading Company.

 

[Ganderite]

The only standard primer I would use for the 7Mag is the Winchester. It is a hot primer.

For reliability, use the magnum primer. A squib on a hunt could be a real disaster.

 

[stubblejumper]

The only standard primer I would use for the 7Mag is the Winchester. It is a hot primer.

For reliability, use the magnum primer. A squib on a hunt could be a real disaster.

And given the recent issues with Winchester primers rupturing, I won't use them in my firearms.

 

[Brianma65]

View attachment 43971My new shooting buddy,Gary , just gave me a couple of packs of magnum primers. Ya never know what he's gonna pull out of the cabinet