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Which Primer for my .300 Win Mag Load?

 
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  #36  
Old 04-27-2014, 11:44 AM
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Re: Which Primer for my .300 Win Mag Load?

Quote:
Originally Posted by tbrice23 View Post
Very surprising that cci200 tested hotter than f210m. And again is the formula the same today as when the test was observed?
That's why I provided the source reference as that would be the baseline.
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  #37  
Old 04-27-2014, 07:40 PM
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Re: Which Primer for my .300 Win Mag Load?

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Originally Posted by DocB View Post
Ok Lefty, I've just about got everything gathered up to start my loads for my 300WM (24" barrel). Going to go with 215gr hybrids and 208gr Amax's, WW brass, and work up separate loads for IMR 7828ssc and Retumbo. (can't find H1000 in my AO). I've found WLR and WLRM primers, the price is not much difference. Question is... will WLR be up to the task or should I just go WLRM, which is where I'm leaning towards.

Thanks Sir!

DocB
It depends on your minimum temperature encountered. If you don't get much below freezing, a wlr should be enough in a 300 win with stick powders. If you are going to get to sub-zero temps. though, I'd go with a mag. primer any day of the week and twice on Sunday.
Sometimes milder ignition will help load uniformity a bit, but you risk the fire not being hot enough in really cold temps in the larger cases, especially when you are using slower powders with a lot of deterrent coating on them.
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  #38  
Old 04-27-2014, 10:45 PM
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Join Date: Oct 2012
Location: Windsor, VA
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Re: Which Primer for my .300 Win Mag Load?

Quote:
Originally Posted by Lefty7mmstw View Post
It depends on your minimum temperature encountered. If you don't get much below freezing, a wlr should be enough in a 300 win with stick powders. If you are going to get to sub-zero temps. though, I'd go with a mag. primer any day of the week and twice on Sunday.
Sometimes milder ignition will help load uniformity a bit, but you risk the fire not being hot enough in really cold temps in the larger cases, especially when you are using slower powders with a lot of deterrent coating on them.
Thanks Lefty, temps here in VA are rarely below zero, but when I move to Wyoming or Colorado, they will get there! lol. I'll be working up my loads again after we move.

I think that I'll work up loads with both primers and both powders now that they're available and see which is the most consistent and accurate, then take it from there.

Thanks for the help!

DocB
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  #39  
Old 04-29-2014, 07:31 AM
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Re: Which Primer for my .300 Win Mag Load?

I have Rem 700 300 Win Mag and shoot 215 Bergers. I tried 210Ms and 215Ms. Mine liked the 210m better. I don't have to worry about extreme cold in Florida. I read a couple reports about the new Marine Corp 300 Win Mag load and they are using 210Ms. I would try them both.

Jay
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  #40  
Old 05-03-2014, 05:26 PM
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Re: Which Primer for my .300 Win Mag Load?



This chart caused me to measure the cup diameter of all the large rifle primers currently available in my reloading room.

My measurements show less difference:

Large Rifle Primer Cup Diameters
Federal GM210M _ _ 0.21025"
Federal GM215M _ _ 0.2105"
CCI 200 (20yr old) _ 0.2105"
CCI 250 (35yr old) _ 0.2095"
CCI 250 (2yr old) _ _0.2105"
Winchester WLRM _ 0.2100"

Conclusion. Measure your primer diameters if really need to know.

The smallest diameter primer I measured was from a box of 35 yr old CCI 250s @ 0.2095". A current CCI 250 measured 1 thou larger at 0.2105"

All the rest were close to the same - within 0.0005".
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