Large Rifle Primer Question

[Henry45]

Hey guys, i'm going to start reloading for my hunting rifles and have a question. I have been reloading for my 300 Win Mag, and I have a 270 Winchester that I want to start loading a few rounds for.

Can I use the Large Rifle Magnum primers for the 270, or do I have to get just Large Rifle primers?

It calls for LR, but I have quite a few LRM primers.

Thanks!

H45

 

[THe Dove]

Can I use the Large Rifle Magnum primers for the 270, or do I have to get just Large Rifle primers?

Yes, you can use LRM primers but validate the loads with your manuals. You say "it" calls for LR. What is "it"? My Speer manual, for one example, lists several loads that were tested using CCI Magnum Primers...

Hope this helps

The Dove

 

[rcmodel]

Yes you can use magnum primers in your .270.

Just start at the starting load and work up as you should anyway.

Conversely, you don't have to use magnum primers in your .300 WinMag just because it says Magnum on it.

You should use the primer type called for in your reloading data.
Lyman #49 says WLR standard.
Hodgdon says WLR standard.
Speer says CCI 250 magnum.
Hornady says WLR magnum.

rc

 

[kingmt]

Don't put to much thought into it. You can load ether with LR or LRM primers.

 

[CGT80]

Some powders may require magnum primers. Hogdon calls for LRM primer for my 460 S&W with win 296 powder, but in the 500 S&W it calls for LR. I don't know why it works this way.

Also, when using small pistol mag primers in light pistol loads such as 9mm under 1000 fps, the mag primer can fail to flatten and seal the case, which can cause damage to the breech face (think I got the part right) of the gun where the back of the shell rests. In hot 9mm loads this isn't a problem.

I don't have any experience or knowledge of problems in rifles when mixing primers, but it is possible. Can you trade some mag primers with someone else for standard primers? Do you plan to shoot very many rounds from the 270?

 

[ArchAngelCD]

Like said above, magnum primers can be used in the 270 Winchester but don't go straight to the Max load in the manual. As with all new loads work up from the starting load.

Actually, you might even benefit using a magnum primer with some of the slower powders that can be used in the 270 Win like H1000, 4831, Hybrid 100V, IMR 7828 and Winchester Supreme 780.

 

[FROGO207]

I will swap back and forth with respect to regular versus magnum primers depending on my supply these days. I see no practical difference most times with substitutions in my reloads. The one thing to be adhered to, especially in pistol rounds, is to always work up a load for each type of primer as pressures will be different most times if you don't adjust the propellant amount. The rule of thumb has always been to use Magnum primers with ball propellants (that are some times difficult to ignite) and regular primers with flake type. As a bonus I have found in some instances that a different primer makes a more forgiving/stable load than the one published. I always keep records of my loads with detailed info and color code the cards using red paper for magnum primers and small florescent target hole patch stuck on it if it is a max load as a caution reminder. You can never be too safe.