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Old January 12, 2015, 06:50 PM   #1
BigBore45
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DPMS LR-308B Load Testing Results

New gun. 50 rnds threw it now. Temporary Bushnell elite 3200. Timney 3lb single stage trigger, Harris bipod, and magpul grip.

Case Hornady Match Or Winchester.
once fired full length resize
Case Trim Length 2.005"
Fed #210 Primer
155 Grain Seirra Palma Match
COAL 2.775

Tested Varget, Benchmark, and IMR 4064. All tests are #1 Min load, #2 Mid load, and if safe #3 max load out of Seirra book 5th edition 7th printing. This is at 100 yards. Did not crony yet, looking for accuracy first. 3 fouler shots first then, (Shot all light loads #1) then (shot all medium loads #2), last (heavy loads #3) waited 15 min in between each group. left all ammo and gun outside and let cool off to outside temp (22 degrees F) before start. CTC stands for center to center of 2 furthest bullets in the group.

Let me know what you guys think, seems to like the IMR & benchmark the best. varget seems not very accurate.
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File Type: jpg NCM_0025.jpg (55.4 KB, 95 views)
File Type: jpg NCM_0026.jpg (56.5 KB, 96 views)
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Last edited by BigBore45; January 12, 2015 at 06:55 PM. Reason: had to add info on fouler shots
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Old January 12, 2015, 08:52 PM   #2
carbine85
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I'm getting good groups out of my DPMS G2 with IMR4064 and a 168 gr bullet. You might try a heavier bullet. Mine doesn't like any of the light stuff. My groups are getting down to around .5 to .75 MOA.
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Last edited by carbine85; January 12, 2015 at 09:29 PM. Reason: corrected bullet weight
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Old January 12, 2015, 09:21 PM   #3
BigBore45
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Old January 22, 2015, 07:00 PM   #4
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Update- more testing. 41 Degrees F. No Wind.

All loads were at max. All Benchmark powder. Same brass & primers. Seems to like the 165 gr. SMK bullets well.

COAL different depending on bullet but matched to reloading book specs

Tried the 155 gr. SMK Palma out of the rem 700 too..

Will Crony next time out.
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Old January 25, 2015, 01:43 PM   #5
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Tested my 42.5 Grains Of Benchmark with the 155 gr. SMKP Over Crony 10' From Muzzle. Tested 10 rounds. Group tests are the same as above. Both guns shooting under 3/4" Groups at 100 yds.

AR-10 DPMS LR 308B 18" barrel

High: 2755 FPS
Low:2738 FPS
Average:2742 FPS



Out of the Remington 700 With 26'' Barrel

High: 2952 FPS
Low: 2937 FPS
Average: 2944 FPS
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Last edited by BigBore45; January 27, 2015 at 07:54 PM.
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Old January 27, 2015, 10:45 AM   #6
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Warmed up yesterday to 72 Degrees F. Tested the 42.5 grains of bench mark behind the 155gr. SMKP and got slight signs of pressure I.E. mild flat primer, and 1 winchester brass had a small mark on the rim from the extractor/bolt face from the AR-10, no signs of pressure from the rem 700.. So much for an extreme powder not changing. Going to drop down to 42.2 grains and test today. Suppose to be high of 73.

Side note: tried some of my old loads from the rem 700 and they were .3 grains off of pressure signs in it, shot 3 in the ar-10 and i have extreme pressure signs, really flat primers/marks on base of brass and even blew 1 primer out. Just information for people that do not know, guns make all the difference, so work up for each gun. I would hate to see what happen if i ran 100 rnds of that threw the gun, it did however feed and eject fine with the 3 i tried and i though i would have far ejections or stuck brass in that situation.
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Old January 27, 2015, 05:24 PM   #7
carbine85
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With my G2 Hunter I have determined that 42.0 of IMR4064 and Varget is over pressured with the 168 SMK.
I'm not surprised you are seeing signs of high pressure.
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Old January 27, 2015, 07:43 PM   #8
BigBore45
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I think you misread my load data, i have 42.5 gr. of benchmark with a 155 gr. not the 168gr. that is a big difference.
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Old January 27, 2015, 07:57 PM   #9
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Ran to the range and tested the 42.2 grains of Benchmark at 80 Degrees F. and seen no pressure signs, crony results for an average of 2728 FPS out of the DPMS, will start to test long range accuracy within the week.
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Old February 28, 2015, 01:27 PM   #10
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Good info. Thanks for sharing.
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Old March 2, 2015, 04:51 AM   #11
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I'm running arcomp out of my 16"recon with a 175 nosler custom comp. just started working it. I'm going with the 40gr
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Old March 9, 2015, 08:04 PM   #12
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BigBore45, you appear to be getting excellent groups with the BM and 4064. I bet they get better as you get a few more rounds through your rifle.
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Old Yesterday, 06:00 PM   #13
BigBore45
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sorry been busy at work and had no time for testing or updates. Tried CFE-223 with 155 gr. palma match. good velocity accuracy not so good. under 1 MOA at 500 yards with the 155 gr bullet and benchmark load at 42.2 gr. Gun is rock solid after 500 rounds and 100 yd groups have turned into about 3/8" CTC. have to go to 300 yards most of the time for testing. i was worried about the cheap price of this gun but it is a winner in my books!
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