338 Lapua loads

14 November 2008, 05:42

dirklawyer

338 Lapua loads

I have a McMillan rifle in 338 Lapua getting made in this caliber. 27 inch barrel, 250-275 grain bullets, so far I've heard the H1000 and the Vitatori 560 and 570 powders are very good. What loads have you guys been using? I'm looking to keep pressures in the 59,000 lb range.

Dirk

14 November 2008, 05:45

390ish

i was shooting a lot of hornady 250 grainers, but don't remember the load, but it was a bunch of 4831sc. think i am pretty much shooting barnes tsx 225 grainers with about 98 grains of h-1000. stick with lapua brass. i think the norma is a bit on the soft side.

14 November 2008, 05:51

jwp475

H-1000 is excellent in the 338 Lapua

59,000 PSI in the Lapau is a very mild load the 338 Lapua is CIP'ed at 67,000 PSI and the Lapau brand brass is considerable stronger than needed for this pressure level

quote:
The reason for .416 Rigby case being a good prototype and parent case, but not the actual choice for the new caliber case was quite clear. For the .338/416 cartridge the velocity of a 16,2 g bullet was 915m/s. A completely different case designed for a higher pressure level was clearly needed. The original Rigby .416 case had a rough 3000 Bar pressure case. The new cartridge was designed for over 4000 Bar pressures. The original pressure definition based on the deformation of the copper pellet method - the crusher method - was specified in the beginning into 56000 CUPs (about 3900 bar). When CIP moved to the piezo transducer period, a mistake was made somewhere resulting in the pressure medium for .338 Lapua Magnum to stay in the 4700 Bar level, even thought the correct level is in the 4200 Bars.

http://www.lapua.com/index.php?id=889

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14 November 2008, 05:59

buck b.

In my ar-30 retumbo 98 gr with 300 gr sierra got less than 1moa at 500 yards

14 November 2008, 17:13

dirklawyer

quote:
Originally posted by jwp475:
H-1000 is excellent in the 338 Lapua

59,000 PSI in the Lapau is a very mild load the 338 Lapua is CIP'ed at 67,000 PSI and the Lapau brand brass is considerable stronger than needed for this pressure level

NECO software posted the maximum pressure at 61,000 PSI are you shure about the 67,000 PSI level? If it's true, I'll definately bump the load up.

Thank's
Dirk