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powder/load recommendation 338lm/berger 250otm

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Unread 09-30-2013, 06:24 PM
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Join Date: Feb 2013
Posts: 912
Re: powder/load recommendation 338lm/berger 250otm

Originally Posted by Bodywerks View Post
FWIW, its a 29" bartlein barrel on a tac338 action 9.5twist 5r and its accurate. I got 1/4" groups or better at 100, a 3 shot 1.1" group at 545, and an 8" 5 shot group my first time out to 1k with it in heavy mirage and varying winds.
From the numbers you provided the lag time between the 250 and 300 are almost identical. I'm not sure what more you will gain besides a little less time of flight with the 250s over the already established success with the 300 groups. You're call but if me I wouldn't mess with the 250s based on the data you provided. If you must stick to Retumbo or H1000 and leave the H4831sc to those cases below 90gr capacity.
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Unread 09-30-2013, 07:27 PM
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Join Date: Jan 2013
Location: Tucson
Posts: 68
Re: powder/load recommendation 338lm/berger 250otm

Lag time might be the same, but trajectory WAY flatter. Ballistics tell me nearly 2mil difference at 1k. Less drop means flatter trajectory and less vertical spread for variances in velocity. In fact, according to Shooter, the 250s have slightly less wind drift at 1k. So at shorter distances the 250s have the advantage IMO.
What other powders do you recommend? If I knew the MV/f for a given powder without having to send a hundred rounds down range I'd have less problem with non extreme powders.
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Unread 10-01-2013, 08:20 AM
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Join Date: Jan 2008
Posts: 1,132
Re: powder/load recommendation 338lm/berger 250otm

If bigngreen is using h1000 with success I would try that..338 RUM and Lapua load data is ALMOST interchangeable, usually if it works for one it will work for the other within a few grains.

I don't really shoot over 1k very often, have switched over to the 250's and really like them. I really like how much flatter thy are too 400 yards on the quicker shots.
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