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338 ultra load development

 
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  #1  
Old 05-22-2011, 06:57 AM
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Location: TARENTUM, PA, USA
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338 ultra load development

started load testing for my new/used 338 ultra mag yesterday. didn't get anything better then about a 2.5" -3 "group.

new cases, 250gr AB, retumbo , and H1000, started 2.0 grains less then max and increased in .5 grain increments. bullets were seated as long as the magazine box would allow. i didn't have any reloader 25 to try. the primers had some cratering, but were not flattened, and bolt lift never got hard on any round. did have one primer blow thru and ruin the case on the lowest H1000 load.

gun is rem 700, muzzlebrake, 3.5 lb trigger, leupold 4.5 x 14 vxIII.

i think i'll try some 225 AB and some reloader 25 with the 250's.

i didn't resize the new cases, just primed and loaded them up. problem?
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Old 05-22-2011, 07:56 AM
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Re: 338 ultra load development

That's not too good.

What rifle is it? Standard factory Remington barrel or custom heavy barrel.
A load of 93 to 95 grains of H1000 seated to 0.020" off the lands with a 250 grain AB should produce excellent accuracy without too much load developement work.

Check you brake is tight and aligned properly to the bore.

The scope or mounts could also be suspect.
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Old 05-22-2011, 08:07 AM
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Re: 338 ultra load development

standard remington 700 light 26" barrel. going with hodgdon's loading of 98.0 max i started with 96.5 and went up in .5 gr till max.

i redid the mounts as i was going to change them out, but didn't have what i thought i had on hand so everything was cleaned and remounted. scope is 1 season old, and shot great on my 257 wthby.

brake is tight but i don't have a way to check alignment.
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Old 05-22-2011, 09:23 AM
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Re: 338 ultra load development

Try 95 grains of H1000. If still no good and you are not happy with the accuracy. Take it to a gun smith. Let him sort out the problem.

With the high cost of .338 RUM ammo it is no use mucking about with a rifle that is not accurate. It may cost you a bit to get a gunsmith to sort out your problem, but at the end of the day you will have a much better rifle and far less frustration.
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Old 05-22-2011, 10:59 AM
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Re: 338 ultra load development

I forgot my factory loaded ammo when i left so i didn't have a baseline to start from. The barrel was clean and according to the previous owner it only had 22 rounds through it.
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Old 05-22-2011, 11:01 AM
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Re: 338 ultra load development

Uniform primer pockets and turn your necks. Freefloat your barrel.
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Old 05-22-2011, 11:09 AM
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Re: 338 ultra load development

Oops. Forgot to mention i did uniform the primer pockets before loading.

I've never turned necks before.

I have a synthetic stock but never did check if it was floated. After there first group i did make sure to rest the gun just ahead of the chamber.

Last edited by YZEATER; 05-22-2011 at 02:32 PM.
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