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Been shootin' the 338 RUM today.
Found the max pressure level at about 65000 PSI. At this point the extraction pressure was only slightly noticeable and primer seating was still good. Above that @ 65700 PSI everything was more noticeable especially loose primer when seating. At 73200 it was smack the bolt handle hard and smack it back to get it started. (Sure wish I had some Win cases).
Load was 91.5gr IMR 7828, Sierra 250gr Game King. Base of case to ogive was 3.041". And it didn't group worth a crap.
Got the Hornady 225 SP Interlock shooting 94gr 7828, Base to ogive 2.889"
3 shots @ 200 adjusted back to 100 was 0.612" Velocities of 3097/3097/3102. PSIs of 61600/61020/64924
It seems from my development and another fella shooting a 338 wildcat that 7828 does best at max loads.
It will be a miracle getting the 250gr bullet anywhere near 2900 (only 70 more FPS than the 338 Win Mag barrel)
Have only tired 7828 and H-1000, so far. Maybe Retumbo for the 250s?
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On the other hand................she had warts
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