What one bullet is most accurate in a .300 Win Mag?

F

FLChinook

New member
I know there are more discussions about this bullet being better or that bullet being better than most of us have had hot breakfasts. But I'm having an accuracy issue with my new Weatherby Accumark in .300 Win Mag. I've tried mostly Berger bullets, 168 and 185 gr., and now find that since Weatherby's have such a large freebore, the Bergers may not be suited to the gun.

If I don't care about killing game and only want to test the accuracy of this gun, which one bullet should I try? Surely, it will be a hollow point; possibly one from Sierra's MatchKing range? What say ye???
 
:( Sorry Chinook only your rifle knows what bullet will shoot best. If the bullets you already tried were hollow point, try boat tail soft point. Then try soft point or fmj. I do wish you luck in your search. Maybe someone else has a load that will perform in your rifle, but you wont know for sure until you pull the trigger.:)
 
You are right, of course. But I'm only getting 2" groups from a bench rest and want to try another bullet that at least has a chance of doing better.
 
It's possible that you're using a bullet that is a little to light for your gun. Do you know what twist the rifling of your barrel is? Try something a bit heavier and see what you get.
 
Do you know what twist the rifling of your barrel is?
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I haven't measured the twist but the spec is 10".

Try some Ballistic Tips. They often shoot well.
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Even Nosler acknowledges that hollow points are the most accurate bullet type and that BTs are a less expensive way to deal with a bullet tip than to do a hollow point. However, for hunting, I suspect hollow points would be less successful :confused:
 
"What one bullet is most accurate in a .300 Win Mag?"

The one which gives the tightest groups.

(Sorry. It's just a character defect. :D)

I've always had tight groups from Sierras in my 1:10 '06 sporter. Always sub-MOA. Sometimes down around 1/2 MOA. That's through some 4,000 rounds over a bunch of years.
 
I think the Weatherby Magnum calibers have a specified freebore in the chamber dimensions. That doesn't necessarily mean that Weatherby uses freebore in rifles built for Winchester Magnum ammo.

You could experiment with seating the bullets out a little more, though you may have to use it as a single shot if the overall length doesn't fit in the magazine.
 
I've tried mostly Berger bullets, 168 and 185 gr., and now find that since Weatherby's have such a large freebore, the Bergers may not be suited to the gun.
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That certainly narrow the range of Berger Bullets. I think you might take advantage of that freebore by trying Berger's 230 grn bullets. They have two, the 230 Gr Hybird (BC G1 .743, G7 380) and the 230 Gr Hybird OTM Tactical (BC G1 .719 G7 .368).

I use to think I could do no better then the 200 Gr SMK in my 300 WM Model 70 1000 yard gun, but I've been working with Berger's 190 VLD and its showing promise in my gun.

Of course all guns are different.
 
I think you might take advantage of that freebore by trying Berger's 230 grn bullets.
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Yikes, my shoulder is hurting at just the thought of that big bullet :)

There seem to be so many factors to consider. A longer bullet may reach my grooves sooner but a longer bullet is harder to stabilize. And recoil will be greater for a 230 gr. vs. a 165 gr. I'm not a complete wuss when it comes to recoil but I did once sell a .338 WM when it was putting my already-depleted rotator cuffs into jeopardy.. :D

I'd like to find a circa 165 gr. bullet that works...

Now that I consider it, my Berger 168s did badly when my scope was bad. It was only the 185s that I tested with the re-conditioned Swarovski (and did not do well). I could go back and recheck the 165s. But if the 185s did not do well, what are the chances for the 168s?
 
Did that muzzle break give a big increase in "bang", I.e., did you find shooters at adjacent benches pick up their stuff and move further away from you..?
 
The most accurate bullet I found for my magnum 30 caliber (30-338) is the Sierra 190 grain match HPBT. Not much of a hunting round, but it is accurate.
 
In the Sierra line, I have used 150-grain soft-points, both flat-base and boat-tail. 165-grains, HPBT. 180-grain, SPBT.

All gave sub-MOA groups, regularly. Reliably.

I mostly used the 150s in my deer hunting. I made one bad hit on a buck and lost him via a setting sun in the scope at 4X. I hit one running buck a bit far back and needed a finishing shot. Otherwise, it was bang/whop/flop on a tad over twenty bucks. Some exit wounds; sometimes none. But if they go flop, what difference does it make?

Ranges from 25 to 450 yards, but mostly around 100 to 200 yards.

Another couple of dozen bucks with my .243, using the Sierra 85-grain HPBT, which is also a tack-driving load.
 
I shoot Berger 155 gr. VLD's out of my 300 WM with excellent results. When I am having a good day, it will group under .5 MOA. Bergers are very sensitive to seating depth and you may want to try different seating depths before giving up. Most people recommend having the bullet in contact with the lands but this is always not possible especially with lighter bullets. They also can perform effectively with a bit of jump and there is an excellent article on Berger's website explaining how to do so. You may want to try their hybrid bullets which are reported not to be as sensitive to seating depth. Also you may want to experiment with different powders since and may have an impact as well. I tried several different powders in my rifle and settled on IMR 4350. Only adjust one variable at a time otherwise you will have difficulty ascertaining which variable provides the best results.
 
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