ADG brass??

Discussion in 'Reloading' started by MagnumManiac, Aug 15, 2019 at 7:07 PM.


Help Support Long Range Hunting by donating:


  1. MagnumManiac

    MagnumManiac Well-Known Member

    Messages:
    1,718
    Joined:
    Feb 25, 2008
    Hi all,
    Quick question.
    Is anyone forming one type of cartridge case into another using ADG brass?

    I am about to receive some in 300WM and would like to form several 100 into 264WM.
    Is the step down too much do you think?
    I know that ADG is thicker than most.

    What say you?

    Cheers.
     
  2. Rhovee

    Rhovee Well-Known Member

    Messages:
    663
    Joined:
    Jun 29, 2017
    You’ll most likely run into issues for your neck clearance to neck diameter of chamber.
     
  3. lancetkenyon

    lancetkenyon Well-Known Member

    Messages:
    1,900
    Joined:
    Jun 3, 2013
    Isn't the .264WM based off the same case dimensions as the 7RM (2.500") not the .300WM length (2.620")?
     
    ENGUNEER likes this.
  4. Tank308

    Tank308 Active Member

    Messages:
    27
    Joined:
    May 4, 2019
    The 7RM was based off the 264WM dimensions. (2.500)
     
  5. wildcat455

    wildcat455 Well-Known Member

    Messages:
    392
    Joined:
    Sep 13, 2017
    Yeah, the 264 Win Mag was out before the 7mm Rem Mag, so you could say the 7 mag is based off the 264 Win mag...
    Not to put too fine a point on it but Lance is essentially correct, both cartridges are based off the same case dimensions, the difference being caliber.

    OP, I think the 7 Mag offering from ADG may be a better choice, if that's what you want to do.
     
    Alibiiv, twister and jjmp like this.
  6. jmcmath

    jmcmath Well-Known Member

    Messages:
    991
    Joined:
    Nov 16, 2017
    I thought the 7RM was a necked down 338 win mag
     
  7. MagnumManiac

    MagnumManiac Well-Known Member

    Messages:
    1,718
    Joined:
    Feb 25, 2008
    Thanks for the replies.
    Looked at the 7RM, but just can't get over that head stamp.
    Would be sacrilege to chamber brass with that designation in a 264WM.

    Any who, the neck thickness isn't a problem, I can turn them down, was more concerned with the shoulder being so thick it might pose a sizing issue.

    I may just have to buy Winchester once fired from blue/white bag fodder.

    The 7mmRM was a Les Bowman wildcat based on the 338WM necked down, and yes, both the 264WM and 338WM share the same case dimensions.
    He brought the idea to Winchester, who rejected it, Remington were convinced it would work and took it on. Needless to say, it was a winner.

    Cheers.
     
  8. AZShooter

    AZShooter Well-Known Member

    Messages:
    2,417
    Joined:
    Dec 12, 2005
    MagnumManiac,

    Just have to ask. What is the issue with a 7 Rem mag headstamp? If you use 300 win mag brass you have that headstamp. Seems to me the 7 Rem mag is a better choice to neck down to .264 as shoulder is in correct place.
     
    Alibiiv likes this.
  9. wildcat455

    wildcat455 Well-Known Member

    Messages:
    392
    Joined:
    Sep 13, 2017
    Until...
    you actually fire a seven mag cartridge in your 264…
     
  10. Rugerman77

    Rugerman77 Active Member LRH Team Member

    Messages:
    32
    Joined:
    Jan 20, 2018
    Check with sleepinggiantbrass.com
    Heck of a nice guy to deal with.
    I buy all my once fired from him and he’s very reasonable.
    Probably got over 400 264 win mag from and may have culled 10.
     
  11. Buzzsaw

    Buzzsaw Well-Known Member

    Messages:
    655
    Joined:
    Mar 18, 2008
    ADG....??? >>>>>HELP? Alpha???
     
  12. Rugerman77

    Rugerman77 Active Member LRH Team Member

    Messages:
    32
    Joined:
    Jan 20, 2018
    Mine was not adj. While I’m sure it’s great stuff but I have gotten excellent accuracy out of my 264s with Winchester and old Herters, like 5 shots behind a nickel groups @100. I’m very particular with how I load though. Fl size everything and beam measure every charge and mic every round. Nothing gets used over .005 off except for zeroing and most are within .002. Nothing really hot though
     
  13. Hondo64d

    Hondo64d Well-Known Member

    Messages:
    435
    Joined:
    May 27, 2003
    Ain’t gonna happen. 7mag won’t chamber in a .264. Neck is too big.

    7 mag brass is the way to go on this.

    John
     
    nicholasjohn likes this.
  14. ThrdKllr

    ThrdKllr Well-Known Member

    Messages:
    79
    Joined:
    Jul 18, 2019
    Absolutely. I make my 7mmRM cases from Winchester 300WM cases. The reason I do this is because virgin 7mmRM brass is from 17 to 21 thousandths shorter than my chamber and by forming it from 300 brass I can make it fit from the first shot. You have to push the shoulder back, trim to length, then turn the necks to proper thickness. I don't own a 300 so no chance of getting brass mixed up. Be sure to use plenty of case lube. I lost 2 cases out of 100 because of collapsed shoulders. Be sure to remove the expander ball from the die before forming.