338 Lapua reloading with 250 Berger and H1000, question on expected speed.

dan belisle

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Mar 6, 2002
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58
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Alberta
My 338 Lapua (a Sako) would push 250's to about 2960. This was with Retumbo or RL25. It wasnt much faster than my 340 Wby though, maybe 20 fps. - dan
 

jessej

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Apr 14, 2010
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Misipi
My lapua loves 2800ish fps.
250s with H1000 and 300s with retumbo.
2840 fps. 26” barrel.
250s are tighter at 1000 but I stuck with the 300s. No pressure signs on either.
300 grain target.

30323581-9008-4FF2-8D7C-D6A4049F3613.jpeg
 

Idaho Hunter1

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May 5, 2019
Messages
144
Location
Boise, ID
As an aside, I loaded my 338LM to just barely short of Mag length. And went elk hunting. Was fortunate enough to get an animal and when I unloaded the Mag after 1 shot, all of the tips (accubond 300gr) were deformed from the recoil. Also the seating depth was deeper than the recipe. Not sure what that would have done to a follow up shot but it was something I never considered during the load development. When I checked for functionality I simply loaded and ejected out of the mag without firing.

If you are going to retry developing a load, might consider examining if you are experiencing this issue.

Best of luck, and I get about 2850FPS with RL33 and 300 gr AB.
 

ARlife4me

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Apr 18, 2018
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691
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Texas
If you don't have any n570, then lrt, magnum, retumbo will get you top velocity for the 300's. rl25, 7828ssc and 869 could be a 2nd choice? Some are more temp stable than 869.
 
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