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Magnum vs LR primers

13 Dec 2013
@ 02:53 am (GMT)

deerndingo

Hi All,
Well, I'll admit it. I made a mistake. I used LR primers in a 7mmRM for load development using new Sako brass. I pushed the load up to 3120fps and thought that backing down to around 3000 would be more what I was after. That would mean 63gr of RE22 under a 162SST pill. Through the week I realised that I'd used LR primers. I'm thinking I'll have to back off about 1.5grains to allow for the use of magnum primers.

Your thoughts (not on the dumb mistake - that's my job)

Replies

13 Dec 2013
@ 03:43 am (GMT)

jason brown

Re: Magnum vs LR primers
I think you will find a lot of guy here are using a normal large rifle primer. I my self am using the federal 210 standard primer.
im not sure about the powder you use.
there are other threads here on loading the 7mag, take a look. but I guess if you want a magnum primer and if whatever your doing is working. then its all good.
13 Dec 2013
@ 06:43 pm (GMT)

Nathan Foster

Re: Magnum vs LR primers
Hi Ian, no worries, you don't really need a magnum primer with that charge rate of RE 22. If accuracy and ES are good, stay with it. I don't often use a magnum primer with the 7mm RM unless I am trying to alter harmonics or ES in a finicky rifle.

I find that the 215 generates 40fps over the 210 primer which is equivalent to 1 grain. So if you want to re-explore, drop 1.5gr below the sweet spot and work back up.
14 Dec 2013
@ 05:29 am (GMT)

deerndingo

Re: Magnum vs LR primers
In my previous post I made a mistake and said 63 grains. No...68grains. Sounds better doesn't it Nathan.
14 Dec 2013
@ 01:43 pm (GMT)

Nathan Foster

Re: Magnum vs LR primers
Much better. I was thinking- man that's a tight tolerance rifle, a no throat.
 

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