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Reloading Berger Bullets


velocity difference with regards to case capacity

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Unread 08-29-2007, 04:24 PM
Silver Member
Join Date: Jul 2001
Location: San Antonio, Texas
Posts: 244

I would have to say that for the 300RUM which is what i consider to be a high capacity case, that one grain of powder capacity would be very hard to detect, as far as a difference in velocity.

I mean most people won't be getting velocity spreads small enough to detect any potential change in velocity.

With my 270-300RUM, it was usually tough to see any increase/decrease in the velocity until I bumped the powder charge by 2-2.5 grains or so, and sometimes there would be no change in velocity. The powders that are available just aren't that consistant.

Just my opinion!
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Unread 08-31-2007, 08:50 AM
Platinum Member
Join Date: Jan 2004
Location: Blackfoot, Idaho
Posts: 8,831
Originally Posted by steve smith View Post

The powders that are available just aren't that consistant.
Ain't that the truth!!!!!!

I posted this before, maybe here???

US 869 - 195gr RBBT - non-sorted cases-Fed215GM
Grains Kirby's MV My MV
88 2771
89 2933
90 2957 2903
91 2993 2945
92 3024 2968
93 3041 3009
94 3070 3036
95 3131 ????
96 3146 3150
97 3192 3201

Mine were shot in sub 20* weather.

Steve, I got the same results as you explained with using 135 and 150 gr bullets. The 150s topped out at 3400+ and shot great.

I've just started on a new batch of REM brass (+/- 1gr). Its a bit different from the first batch that I used up. Velocities are just a bit faster maybe 30FPS.
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
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Unread 08-31-2007, 09:16 AM
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Join Date: Feb 2004
Location: Pennsyltucky
Posts: 2,630
did a little testing this morning using cases that held exactly 110-111-112 gr of powder and kept every thing else the same. including weighing the primers.numbers are the velocity of each shot other than the first one where i changed the battery and got a reading every time from then on.

110 111 112
xxxx 3091 3081
3083 3095 3120
3100 3111 3096
3112 3095 3114

3098 3098 3102 averages of each

i was a little surprised and disappointed by these results. of course it's only a few shots, strings of 10 would have been a little more accurate. the averages aren't as far apart as i thought they might be. might do another round using the same cases and see how they of right now i would have to say that even cases with 2 gr of powder capacity difference doesn't make much difference at all!
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