close
Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Berger Bullets

Reply

Which Primer for my .300 Win Mag Load?

LinkBack Thread Tools Display Modes
  #36  
Unread 04-27-2014, 11:44 AM
Platinum Member
 
Join Date: Dec 2008
Location: Great Falls, MT
Posts: 9,266
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.
__________________

I voted for my "FREEDOM", "GUNS", and "MONEY" - keep the change - UNK.



"I am always proud of my country!"

"Leadership Rule #2: Don't be an ***hole." - Maj Gen Burton Field.
Reply With Quote
  •   #37  
    Unread 04-27-2014, 07:40 PM
    Platinum Member
     
    Join Date: May 2012
    Posts: 4,132
    Re: Which Primer for my .300 Win Mag Load?

    Quote:
    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.
    Reply With Quote

      #38  
    Unread 04-27-2014, 10:45 PM
    Silver Member
     
    Join Date: Oct 2012
    Location: Windsor, VA (but heading for the Rockies)
    Posts: 423
    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
    __________________
    http://www.heaven-scent-rescue.org

    "History does not long trust the care of freedom to the weak or timid" Dwight David Eisenhower
    Sic Semper Tyrannis...Veritas et Aequitas

    Reply With Quote
      #39  
    Unread 04-29-2014, 07:31 AM
    Silver Member
     
    Join Date: Mar 2011
    Location: Florida
    Posts: 425
    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
    Reply With Quote
      #40  
    Unread 05-03-2014, 05:26 PM
    Platinum Member
     
    Join Date: Apr 2005
    Location: Alaska
    Posts: 4,695
    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".
    Reply With Quote
      #41  
    Unread 12-17-2015, 02:50 PM
    Bronze Member
     
    Join Date: Sep 2008
    Location: Reno Nv
    Posts: 82
    Re: Which Primer for my .300 Win Mag Load?

    My Dad gave me a box of 1000 WLRM. I don't see much talk about these on here. Would be using them for 300 Win Mag. Any advise for this??
    Reply With Quote
      #42  
    Unread 12-18-2015, 02:52 AM
    Silver Member
     
    Join Date: Oct 2012
    Location: Windsor, VA (but heading for the Rockies)
    Posts: 423
    Re: Which Primer for my .300 Win Mag Load?

    Quote:
    Originally Posted by Wisner74 View Post
    My Dad gave me a box of 1000 WLRM. I don't see much talk about these on here. Would be using them for 300 Win Mag. Any advise for this??
    I would tell your Dad "Thanks Dad", give him a big hug and ask him "Got any more?"

    Load 'em up! They work just fine.

    DocB
    __________________
    http://www.heaven-scent-rescue.org

    "History does not long trust the care of freedom to the weak or timid" Dwight David Eisenhower
    Sic Semper Tyrannis...Veritas et Aequitas

    Reply With Quote
    Reply

    Bookmarks

    Thread Tools
    Display Modes



    All times are GMT -5. The time now is 06:29 AM.


    Powered by vBulletin ©2000 - 2017, Jelsoft Enterprises Ltd.
    Content Management Powered by vBadvanced CMPS
    All content ©2010-2015 Long Range Hunting, LLC