338RUM factory brass weight

86alaskan

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Can someone that has a piece or two of remington 338RUM brass weigh it for me? I'm working up loads for mine with ADG brass and I ran into pressure over 4gr under the IMR listed max. I'm loading 300gr SMK at 3.75" which is .160 longer than book so that should help lower pressure as well. Trying to figure out how much heavier this brass really is.
 

phorwath

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Alaska
I scrounged around the reloading room and found two R-P cases.
With no primers, these two empty casings weigh:
1) 266.5gr
2) 267.4gr
 

86alaskan

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Central Missouri
thanks, I'll compare when I get home. that 3.75 load is off the lands, not quite sure how far as I'm just getting started with this one. I'm using IMR 8133 and the max load with shorter COAL is 96, but at 92 I had to tap the bolt open, was definitely sticky.
 

86alaskan

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Measured my brass, came in right at 260 also. Guess I'll just dial back. I hope I don't lose too much speed with a low a charge as I'll have. I'm guessing around 90gr 8133
 

gunaddict

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I have over 600 NEW, 338 Ultra Mag Remington brass fully prepped and weighed. All new brass has been neck sized, trimmed, chamfer inside and out, and flash holes done. These 338 Ultra Mag brass is from 4 different lots. All brass is sorted within 1 gr. Example: 265.0grs to 265.9grs.
29rds-262grs
28rds-263grs
113rds-265grs
160rds-266grs
158rds-267grs
98rds-268grs
34rds-269grs
I hope this helps
 

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