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Load development for 300 Win Mag

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  #1  
Unread 04-25-2013, 04:40 AM
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Join Date: Apr 2013
Posts: 43
Load development for 300 Win Mag

Hi

I have just started reloading and would like to get your thoughts on developing a load.

Since this is the first time I have reloaded I have started with a relatively "weak" load. Ive used a 180 grain nosler combined T with 69.3gn of S 385 powder which should give a velocity of 2700ft/s. Ive also found that the bullet hits the rifling at 3.5 inches and have loaded my rounds conservatively at a COL of 3.42 inches.

I would like to know whats the best way to increase the load and the COL without running into any problems.
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  •   #2  
    Unread 04-25-2013, 02:01 PM
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    Join Date: Feb 2006
    Location: az
    Posts: 3,211
    Re: Load development for 300 Win Mag

    what rifle, what are you shooting at? do you have any re-22 and do you have any 210 berger??
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      #3  
    Unread 04-26-2013, 02:46 AM
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    Join Date: Apr 2013
    Posts: 43
    Re: Load development for 300 Win Mag

    HI Ronin

    I am using a Remington model 700 sps wood with 24 inch barrel. I think Ill be able to get my hands on 210 berger.

    Mohsin
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      #4  
    Unread 04-26-2013, 08:12 AM
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    Join Date: Jan 2011
    Location: southeast Idaho
    Posts: 278
    Re: Load development for 300 Win Mag

    H1000, 208 amax or 210, 215 Berger. 20-40 thousandths from rifling or as long as will fit in your magazine. Start at 73g and work your way up. With Winchester or nosler brass. Brass capacities vary a lot in 300 win mag so adjust your load accordingly.
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      #5  
    Unread 04-28-2013, 02:25 PM
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    Join Date: Apr 2013
    Posts: 43
    Re: Load development for 300 Win Mag

    Hi Guys

    Thanks for the responses.

    I went to the range on Saturday with 20 Sierra match kings 175 gr loaded with 69.3 grains ( max is 73.5 gr) of Somchem S385 ( this is the only magnum powder available in South Africa).

    The first 4 of my first ever batch hang fired ( a fraction of a second delay). The rest of the rounds seem to fire adequately but I couldnt shoot any good groups. The best I could do was 2inches at 200m.

    Any ideas why the initial rounds would hang fire?? I was using Sellier and Bellot primers.
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      #6  
    Unread 04-28-2013, 03:36 PM
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    Join Date: May 2008
    Location: South of Canada and North of Wyoming
    Posts: 6,068
    Re: Load development for 300 Win Mag

    When I do load development I like to start with my bullets .010-.005 off the lands. For 2 reasons... first, more accurate loads are usually seated closer to the lands... second, if I want to experiment with seating depth, I am seating the bullet farther from the lands which should avoid pressure problems.
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