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Accuracy with 300 Win Mag.

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Unread 06-30-2008, 07:21 PM
Junior Member
Join Date: Apr 2008
Posts: 8
Accuracy with 300 Win Mag.

I am currently assisting a friend who's developing handloads for a Remington XCR 300 Win Mag. We conducted a proper barrel break-in period with the standard of shoot-clean, shoot-clean for the first 20 rounds through the rifle. We were using Factory Winchester 180 grain Power Point ammo and with the the last two rounds obtained a group at .370 inches (we were also trying to sight in the scope too). We wanted more rounds before we counted that grouping but had run out of factory ammo by then.

So next was handloads. We used Nosler 180 gr. Solid Base Ballistic Tip bullets and Reloader 22 powder. We experimented with loads from the lowest charge of 74.0 grains to the highest of 75.5 grains according to the Nosler reloading manual. We also tried an OAL from .010" off the lands to 0.025" off the lands, with the tightest group coming from an OAL of 3.587" (which was 0.010" off the lands). This group was the tightest and only measured at 1.015 ". Factory ammo had an OAL of 3.340". Factory ammo also chronoed at 3020 fps and the 74 gr. handloads were 3060 fps.....so pretty consistant.

The owner is looking for the rifle to consistantly group at no more than 1 MOA accuracy....so obviously we were not happy with this performance. Our last thought was to load the bullets to the factory AOL and see if it can group as nicely as those last two factory rounds did when they printed at .370".

Has anyone here experimented with a 300 Win Mag and also with heavier bullets.....? Any help would be appreciated.

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Unread 06-30-2008, 08:22 PM
Silver Member
Join Date: Aug 2006
Location: corpus christi tx
Posts: 424
i shoot 79 gr h4831 behind a 180 accubond fed gm 215 primers oal 3.34 right at 3100fps out of a 26 inch hart barrel it will hold 1/2 moa at 500yds if i do my part, i would start out lower on the powder charge and work up
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Unread 06-30-2008, 09:09 PM
Junior Member
Join Date: Apr 2008
Posts: 8
Our rifle has a 26" factory barrel and we started at a low charge of 74.0 grains. The highest charge we've found is in the Hornady manual at 76 grains with RL22 powder. Didn't know of maybe we should experiment with heavier bullets....
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Unread 07-01-2008, 07:11 AM
Junior Member
Join Date: Jan 2008
Posts: 24
I'm currently working with the 208gr AMaxes and like the results. Its a suitable target round and good hunting round for the reach of a 300 Win Mag. On a good day I can turn in a paper full of .5 moa and smaller groups. I'm working with 75grs of IMR 7828SSC and getting an average of 2925 fps MV. Next I'm going to work with my jump distance - so I'll get back with you when I find that.
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Unread 07-01-2008, 09:29 AM
Bronze Member
Join Date: Feb 2008
Posts: 83
300 Win Mag

I've had best succes with non-magnum primers.
H1000 with WILDCAT 190 and 210 grain bullets
The Berger VLD 210's grain shoot great.

The rifle is a Greywolf SAKO 75 with NXS scope

Previusly tried bullets were the Accubond 180's, Scirroco 180 and TSX 180

Expect more recoil with the heavy bullets!
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Unread 07-01-2008, 10:03 AM
Junior Member
Join Date: Apr 2008
Posts: 8
We were mainly starting to wonder if the rifle just didn't like the 180 gr. bullets and maybe we should try heavier ones like 200 & above....
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Unread 09-16-2008, 12:44 AM
Bronze Member
Join Date: Sep 2008
Location: Behchoko, NT
Posts: 50
Re: 300 Win Mag

Originally Posted by AlbertaAl View Post
I've had best succes with non-magnum primers.
Non-magnums eh? Interesting. I'm starting to load my newly built 300 and am just waiting for a few more bits before I get seriously into the 210 Bergers. Hard to find up here in the boons though.
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