Load development for 300 Win Mag

Discussion in 'Long Range Hunting & Shooting' started by mosh338, Apr 25, 2013.

  1. mosh338

    mosh338 Active Member

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    Apr 25, 2013
    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.
     
  2. roninflag

    roninflag Well-Known Member

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    what rifle, what are you shooting at? do you have any re-22 and do you have any 210 berger??
     

  3. mosh338

    mosh338 Active Member

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    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
     
  4. Shane1

    Shane1 Well-Known Member

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    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.
     
  5. mosh338

    mosh338 Active Member

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    Apr 25, 2013
    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.
     
  6. MontanaRifleman

    MontanaRifleman Well-Known Member

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    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.