Load development for 300 Win Mag

[mosh338]

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.

 

[roninflag]

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

 

[mosh338]

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

 

[Shane1]

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.

 

[mosh338]

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.

 

[MontanaRifleman]

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.