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· Registered
1,379 Posts
The problem with the .300 Win Mag is the fact that if you seat bullets in deep enough to fit the magazine in most rifles, you are a long, long ways away from the rifling. My Winchester Laredo is like this. Bullets in far enough to load the magazine? Expect about 2 1/2 to 3 inch groups at 100 yards. Use a tailored handload that the rifle likes? Oh, my gosh!!

My load (safe in MY rifle, work yours up carefully):

New Winchester cases
175 grain Sierra MatchKing
70.0 grains, IMR 4831
Federal STANDARD Match Primers
Seated to a COL of: 3.510 inches, no crimp

Measured group: 3 rounds into .384 at 100 yards; five rounds into .468 at 100 yards.

Rifle: Winchester M70 Laredo
Glass bedded, everything else box stock
Scope: Simmons (yes, I said Simmons)8-32x44

Good luck with your rifle!

"Be not afraid of any man, no matter what his size;

When trouble rises, call on me and I will equalize."

· Registered
1,379 Posts
Believe it or not, I agree with your post. The .300 Win Mag can be a frustrating rifle to shoot. Loaded with a round it likes, it can outshoot almost any other rifle, IMHO. Out of the box, and with factory ammo, it can cause gray hairs.

My M1A, though--now, that's a different story. I tried a recent range experiment: First loads were as follows:

Federal Gold medal factory new cases,
Federal LR Match primers
175 grain MatchKing
40.0 of IMR 4895
Cases deburred, pockets uniformed, neck turned, etc, etc, etc.
Each charge handweighed
Each bullet weighed.

Second lot:

150 grain mil surp pulldown bullets, complete with leftover tar and sealant (eeewwww)

42.0 IMR 4895, measure thrown

Federal Match primers

Different cases from the brass bin

Uniformly crimped to h-e-double toothpicks with the Lee Factory Crimp die.

This was done to see just how much of a difference all the accuracy steps made.

Rifle: SA Nat'l Match M1A (old model) with Kahles 3-12x56 scope mounted

What happened?

The MatchKings shot like doo-doo! Patterns at 100 yards never fell below 2 inches.

The mil-surp, throw together, bottom of the brass barrel plinkers?

Groups comparable in size to the .300--five groups fired, ALL under one-half inch. Two screamers--.250 and .298, respectively. Rounds literally stacked on top of each other.

So, again I agree--the M1A is a much more forgiving rifle to shoot with standard ammo loaded to factory length.

(Doesn't kick the bejeesus out of you on the bench, either......

"Be not afraid of any man, no matter what his size;

When trouble rises, call on me and I will equalize."
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