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Old April 9, 2011, 03:52 PM   #1
Blackops_2
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Join Date: July 20, 2008
Location: Mississippi
Posts: 2,591
Alliant 2000-MR

Quote:
Originally Posted by SagebrushShooter
Rifle: Blueprinted Rem 700 w/25" inch Krieger(1-10); +2000rds down the tube.

Cartridge: .308 win
Case: Lapua
Primer: CCI BR-2
Bullet: Berger 185 grn BT Long Range
Powder: Alliant Power Pro 2000-MR
COL = 2.2830

Temp = 56 F
Elev = 4,600 ft

46.5 grns:
1 - 2647
2 - 2677
3 - 2684 ES = 37 fps
4 - 2669 AVG = 2670 fps
5 - 2675

47.0 grns:
1 - 2707
2 - 2725
3 - 2714 ES = 18 fps
4 - 2725 AVG = 2717 fps
5 - 2716

47.5 grns:
1 - 2744
2 - 2754
3 - 2715 ES = 39 fps
4 - 2729 AVG = 2737 fps

48.0 grns:
1 - 2764
2 - 2753 ES = 11 fps
3 - 2762 AVG = 2760

48.5 grns:
1 - 2762
2 - 2751 ES = 11 fps
3 - 2754 AVG = 2756 fps
5 - 2743

Accuracy:
My two best groups were fired with the 48.0 and 48.5 grn charge weights:

48.0 grn, 3 shots = 0.369 inches CTC
48.5 grn, 3 shots = 0.275 inches CTC

Pressure:
48.5 grns of 2000-MR was the max load listed on Alliants website for a 180 Fusion bullet, so this charge weight is where I decided to stop. However, I was not getting any excessive pressure signs. Primers were somewhat flat, but no ejector marks, or loose primer pockets or primers falling out. I've seen more pressure with my Varget and Sierra 175's than I did with this combo.

Notes:
I used once fired Lapua brass that had been fire formed to my chamber, neck sized it only, no other case prep. The 185 Berger is a really long bullet for the .308 case, it's a full .150-.200 longer than the Sierra 175 MK. I used a 7 inch drop tube when charging the cases and did not have any issues with the base of the bullets running into the powder column and I seated all bullets to mag length. This powder is very fine, it is a round-flake type and looks a lot like Reloader 15 just a bit more glossy.

-SB Shooter
I didn't know if SB shooter is a member of the TFL, but he posted this on snipers hide and i figured i'd share it with everyone. It's pretty damn impressive. A 185gr Berger BT LR @ 2700 is super sonic out to 1200yds, it's like giving a whole new lifeline to the .308. I'm excited, imagine 2000-MR in a .260 with a 142 SMK @ 2950fps.

Quote:
Originally Posted by SagebrushShooter
Altitude: 5300 ft
Temp: 36 F, it's still fricken cold here!

All charges were thrown with RCBS Chargemaster, 48.0 grns of Alliant 2000-MR, 10 shot string:

#1 2767 fps
#2 2762 fps
#3 2760 fps
#4 2745 fps
#5 2788 fps ES = 55 fps, way too high.
#6 2779 fps
#7 2762 fps
#8 2733 fps
#9 2765 fps
#10 2758 fps

Highest to lowest:
2788
2779
*****
2767
2765
2762 If we hack off the highest and lowest, the ES = 9 fps.
2762
2760
2758
*****
2745
2733

My thoughts are this, I do not do any brass sorting whatsoever. The shot that dumped low at 2733 had a loose primer pocket from a previous firing (observed some gas leakage). The highs, 2779 and 2788 I feel are neck tension issues and possibly primer pockets as well (I noticed some bullets were seating much more forceful than others). I measured with a digital caliper and the majority of the loaded rounds were running at .337 at the neck, with the neck size bushing at .335 that gave me .002 of neck tension, perfect. A few of the rounds were running into .338-.339 range though, I feel that may account for some of the higher velocities I saw. I think this powder has some tremendous potential in the .308, accuracy is phenominal out to 500 yds (1/2 MOA). I just need to be a little more meticulous in my loading process and I think my highs and lows will clear up. let me know what your guys thoughts are?

-SBS
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