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Load development for 300 Win Mag

 
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  #1  
Old 04-25-2013, 04:40 AM
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Join Date: Apr 2013
Posts: 40
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  
Old 04-25-2013, 02:01 PM
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Join Date: Feb 2006
Location: az
Posts: 2,337
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  
Old 04-26-2013, 02:46 AM
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Join Date: Apr 2013
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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  
Old 04-26-2013, 08:12 AM
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Join Date: Jan 2011
Location: southeast Idaho
Posts: 273
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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Old 04-28-2013, 02:25 PM
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Join Date: Apr 2013
Posts: 40
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  
Old 04-28-2013, 03:36 PM
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Join Date: May 2008
Location: South of Canada and North of Wyoming
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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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