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HELP!! 300 Win Mag Ammo

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Unread 08-15-2012, 05:17 PM
Bronze Member
Join Date: Feb 2012
Location: Texas
Posts: 84
HELP!! 300 Win Mag Ammo

Ok guys, I recently rebarreled my Winchester M70SS 300 win mag. I've kept the caliber the same, but replaced with barrel with a 1-10 twist Hart#5 contour fluted barrel cut to 24". The action was also blueprinted and squared, sitting in a HS precision stock. I went with the 1-10 twist on the recommendation of Hart, as they said it would be the best all-around twist for my style of hunting. Is my twist to fast for lighter bullets????The gun will be used for mostly whitetail, but will be used on bigger game in the future.

So far I have tried:
1. Remington Corelokt 150gr psp 1.5" group (advertised @ 3250fps, chrono'd 2909fps
2. Winchester Powerpoint 150gr and 180gr 2" group on 150's and 1.5" group on 180's
3. Hornady Custom 165gr btsp 2.5"group
4. Hornady Superperformance 165gr GMX 1.5" groups
5. I just received today my HSM 168 Berger VLD Hunting. I will try those in the morning.

I"m starting to get a little frustrated with the accuracy of this gun after spending almost a grand in custom work. I know my gunsmith does excellent work and I don't believe that is the issue. I shot all these off a solid rest and I'm not sensitive to recoil, so I don't think its me either. I really don't want to have to get into reloading to get this gun to shoot sub moa. Could ya'll please provide some insight on some other ammo I could try that you may have had or not had good luck with.
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    Unread 08-15-2012, 05:49 PM
    Platinum Member
    Join Date: Dec 2008
    Location: rathdrum, id.
    Posts: 5,015
    Re: HELP!! 300 Win Mag Ammo

    First of all, your rifles twist is not the problem with your accuracy. I would probably try some Federal premium ammo, but with everything you have already tried, I'm not too sure that will work either? You may have to handload to squeeze out the accuracy? There could also be something else wrong, including bedding, scope, etc. Good luck........Rich
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    Unread 08-15-2012, 06:49 PM
    Silver Member
    Join Date: May 2012
    Location: Texas
    Posts: 268
    Re: HELP!! 300 Win Mag Ammo

    Before I started reloading I use to shoot hornady 180 gr spt. I tried the 160 s and the rifle hated them. But it loves 180gr. Give those a try
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    Unread 08-15-2012, 07:10 PM
    Silver Member
    Join Date: Mar 2011
    Location: Florida
    Posts: 425
    Re: HELP!! 300 Win Mag Ammo

    With a 1-10 twist, I think a 180 or heavier would work
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    Unread 08-15-2012, 08:26 PM
    Platinum Member
    Join Date: May 2012
    Posts: 4,138
    Re: HELP!! 300 Win Mag Ammo

    I've got a 1 in 10 twist browning 300 win and it'll shoot from 125 grain to 220 grain match well. I'd try fed ammo or let a custom loader or buddy that loads get their hands on your rifle. Custom loading may be the only way to shrink the groups without spending a fortune.
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    Unread 08-15-2012, 08:41 PM
    Gold Member
    Join Date: Jun 2011
    Location: Kentucky
    Posts: 699
    Re: HELP!! 300 Win Mag Ammo

    i have same barrel on a 300wsm, do me a favor, buy a box of the vortex 150 grain 300win mag TTSX and watch what happens, you can screw around with all those others, buy one $40 box of ammo and watch what happens
    Life is Short; Live, love, Hunt
    270 Winchester.......Jack had it right
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    Unread 08-15-2012, 09:40 PM
    Silver Member
    Join Date: Jan 2005
    Posts: 349
    Re: HELP!! 300 Win Mag Ammo

    I would think that gun should shoot far better than it is even with factory ammo....I have done alot of reloading for the 300WM and they are usually not that hard to please...if you can find somone that reloads and see if they can help you out..I would probably start with some 200gr accubonds or the 208 amax using H1000 or ramshot magnum...or some 180gr accubonds with RL22 or 7828..somwhere in there that setup should shoot under .75...
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