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Anyone own a 7mm 300 Win Mag?

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  #456  
Unread 09-25-2013, 11:43 PM
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Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by cummin_un_glued View Post
shooting 180 bergers 78gr got me 3150fps and 82gr got me 3250fps at about the same pressure as 76gr of h1000. going to do more testing with it. 82gr was like a 99% load for case capacity.
Wow, great numbers there. It definitely appears to be the perfect combination of burn rate and energy density for this cartridge and bullet combo.

Please keep us posted as you develop further. Most everyone so far has stuck with H1000 with a few Retumbo users thrown in.
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  •   #457  
    Unread 09-26-2013, 12:10 AM
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    Re: Anyone own a 7mm 300 Win Mag?

    I wanted to test Retumbo also but I havnt been able to get any. I am going to do a lot of shooting Friday if all go's well so more results then.
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      #458  
    Unread 09-26-2013, 06:00 AM
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    Join Date: Dec 2005
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    Re: Anyone own a 7mm 300 Win Mag?

    cummin_un_glued,

    What barrel length are you using? Any pictures of your rifle? With performance that you are getting from RL-33 why even bother trying Retumbo?
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      #459  
    Unread 09-26-2013, 09:26 PM
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    Re: Anyone own a 7mm 300 Win Mag?

    Quote:
    Originally Posted by AZShooter View Post
    cummin_un_glued,

    What barrel length are you using? Any pictures of your rifle? With performance that you are getting from RL-33 why even bother trying Retumbo?
    here is the link to the thread about my rifle and I continue to post my findings in it.

    my new 7mmx300win

    why bother with Retumbo? because nobody can say for sure yet if RL33 is temp sensitive and i'm not done with testing it either, all I have done is velocity testing.

    Subscribe to my thread and I will continue to post as I try different powders and bullets in it.

    FWIW I got 3150fps with 75gr of H1000 also but ran into pressure before I got to 3250fps so the RL33 for sure gained me some velocity but like I said i'm not done testing. heck I havnt even tried different seating depths yet just powder charges checking for pressure/velocity
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      #460  
    Unread 10-27-2013, 05:53 PM
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    Join Date: Jul 2007
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    Re: Anyone own a 7mm 300 Win Mag?

    Got a chance yesterday to shoot my 7mm Practical. Rounds 21 thru 35 in new rifle. This was the first loading after fire forming 20 cases. Used a CED chrono.
    168 Berger VLD
    H1000
    WLR primer
    RWS cases
    Barrel is 28 inches.

    75.2 gr. 3113 fps
    75.4 gr. 3138 fps
    75.6 gr. 3156 fps
    75.8 gr. 3180 fps
    76.0 gr. 3231 fps
    Groups were not good but 75.4 and 75.8 were tightest. Going to use these two charge weights and work on seating depth next chance I get. Work is getting in the way of everything. Not much info but all I have at the moment.
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      #461  
    Unread 10-27-2013, 09:15 PM
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    Re: Anyone own a 7mm 300 Win Mag?

    finally got to do some ELR testing with mine. I settled on 80gr of RL33 getting me 3200fps average with real good consistency.

    7mmx300Win @ 1765 yards
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      #462  
    Unread 10-28-2013, 12:09 AM
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    Re: Anyone own a 7mm 300 Win Mag?

    Quote:
    Originally Posted by cummin_un_glued View Post
    finally got to do some ELR testing with mine. I settled on 80gr of RL33 getting me 3200fps average with real good consistency.
    3200 fps!!! Holy cow! That barrel wont last long.

    I was using 74g Retumbo Berger 180 Hybrid, 28" Krieger barrel 3150fps barrel went south with less then 500 rounds. Its in for a new Bartlein
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