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6mmAR.com |
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The 6mmAR Turbo 40° Improved |
Now the ultimate in 6mm power and performance for your AR-15. The 6mmAR Turbo 40° Improved (left) has a significantly larger powder capacity than the 6mmAR (right) and can easily drive the larger 105-108 gr bullets in the 2900 fps range.
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The Turbo 40 . . . Even More Capacity For More Power and Velocity - The 6mmAR Turbo 40° Improved has it all - accuracy, velocity, superior down range bullet performance - No Compromises! The 6mmAR Turbo 40° Improved case is the 6mmAR taken to the ultimate. The case capacity is expanded beyond the 6mmAR. In addition, the 6mmAR Turbo 40° Improved is and Ackley type case with the proven 40 degree shoulder angle which is known to many for yielding superior cartridge performance, both in terms of accuracy and velocity. |
Shooting the 6mmAR Turbo 40° Improved
We Are Accepting Orders For 6mmAR Turbo 40° Improved Uppers - Call (215) 348-8789 for details.
Above: This Turbo 40 upper (for high power competition) features a 28" Hart 1:8" twist barrel, the gas port moved 2" further out, and a side charging handle upper using the thick walled very rigid DPMS Low Pro upper receiver.
Above: This Turbo 40 Varmint upper features a 24" Krieger 1:8" twist barrel, and a side charging handle with a heavy walled rigid DPMS Low Pro upper receiver. It also has a muzzle brake and a special vented hand guard.
The 6mmAR Turbo 40° Improved - easy to make!
The 6mmAR Turbo 40° Improved cartridge is easy to make, just take 6.5 Grendel cases, run them through your resize die, load them and shoot them - No neck turning - No Trimming - Not Complicated!
Above - Redding Die Sets Are Available for the Turbo 40
Powders:
There are a number of powders that have been tested and work well with the
Turbo 40, among them:
Hodgdon's H4895
Alliant Reloder 15
VihtaVuori N540
VihtaVuori N140
Accurate AA2520 (ball powder)
Hodgdon's Varget
Accuracy is Excellent!
Above = 10 Shot Slow Prone Testing Group
With 6mmAR Turbo 40° Improved
The target above was shot slow prone at 100 yards while doing some basic load work ups for 600 yards. Since this was initiaI load testing, I decided to start with a loading down around 2800 fps, so the powder measure was set to throw around 28.5 gr of H4895 and the cases were loaded with Beger 105 gr VLD bullets .010" in the lands. The cases were previously fire formed and re-sized and primed with CCI BR-4 primers. This was shot with a scope in slow prone with a sling and the target is the slow prone target.
Below = Additional 10 Shot Slow Prone Testing Group
With 6mmAR Turbo 40° Improved @ 100 Yards - Shot
Slow Prone With Sling
The above 10 shot slow prone target was shot with the same load and fire formed brsss as the prior target above (28.5 gr of H4895 with Beger 105 gr VLD bullets .010" in the lands and a BR-4 primer).
Warning on Loads and Loading: The listed loads above and below were safe and workable in the rifles that were tested, but that does not guarantee they will be appropriate for your rifle or upper. It is your responsibility to work up your own loads in a safe manner. We recommend you reduce all loads by 1.5 to 2 grains of powder and work up from there with your own rifle. We make no representation that any of the listed loadings will be appropriate or safe for your rifle or upper.
Load Testing and Load Data:
No Brainer Loading: If you are looking for an easy load to get going with, try 28 - 28.5 gr of H4895 with a BR-4 primer with whatever bullet you have (between 80-108 gr) and you should be up and shooting very accurately right away.
For Fire Forming Try:
27.5 - 28 gr. H4895
28.5 gr. RL15
29 - 29.5 gr. N540
Some of the fire forming loads are very very accurate and do not dismiss them for shooting across the course at 200 yards or in short course matches.
NOTE: The Turbo 40 cartridge has the capacity to run naked (i.e. non-moly) 105-108 gr. bullets up in the 2900 fps range with powders like RL15, VV N540 and Varget. Varget is a little bulky and the higher loadings will be compressed.
Testing in California:
June 21, 2008 Sacramento 100 yard Bench Rest Iron Sights Five Shot Groups Loaded in the lands .010”
Powder – Load – Bullet –-- OAL –- MV – ES – SD - Group
RL15 29.5 -- B105s -- 2.370” –2811 – 24 –09 ---- 0.665”
RL15 29.8 -- B105s -- 2.370” –2846 – 39– 14 ---- 1.058”
RL15 30.1 -- B105s -- 2.370” –2876 – 23 –09 ---- 0.475”
Varget 30.0 -- B105s -- 2.370” –2843 – 28 –11 ---- 0.657”
Varget 30.3 -- B105s -- 2.370” –2871 – 17 –06 ---- 0.520”
August 16, 2008 Sacramento 100 yard Bench Rest Iron Sights Five Shot Groups
Powder – Load – Bullet –-- OAL –- MV – ES – SD - Group
RL15 30.1 -- B105s -- 2.443” –2882 – 05 –02 ---- 0.305”
RL15 30.4 – B105s -- 2.443” –2907 – 27 –09 ---- 0.545” Try for 600
RL15 30.1 -- B108s -- 2.320” –2862 – 19 –07 ---- 0.475”
RL15 30.4 – B108s -- 2.320” –2896 – 07 –02 ---- 0.461” Try for 600
H4895 28.5 – B90s ---- 2.270” –2876 – 20 –08 ---- 0.721”
H4895 29.0 – B90s ---- 2.270” –2922 – 13 –05 ---- 0.378” 200 Load
H4895 28.5 – B105s -- 2.443” –2808 – 11 –04 ---- 0.504”
H4895 29.0 – B105s -- 2.443” –2847 – 21 –07 ---- 0.848”
H4895 28.5 – B108s -- 2.320” –2780 – 07 –02 ---- 0.458”
H4895 29.0 – B108s -- 2.320” –2814 – 19 –07 ---- 0.550”
June 26 Sac Practice Fire Forming with B95VLDs not good for 600yards =481-08X
July 17 Sac Practice FF @200,300 (100-7X sitting) 196-09X @ 600 using 30.1 RL15 B108s =485-15X
July 24 Sac Practice FF @200,300 (95-2, 95-5, 96-2, 196-10)=485-21X used @ 600 yards 28.5 H4895 B105
July 31 Sac Practice FF @200 (92-0, 100-04, 100-06, 198-12X)=490-22X used 28.5 H4895 B108 @300&600
Aug 07 Sac Practice FF @200,300 (96-3, 97-02, 96-02, 191-05X)=480-12X used 28.5 H4895 B108 @600
Aug 14 Sac Practice FF @200 (94-1, 99-06, 100-03, 199-09X)=492-19X used 28.5 H4895 B108 @300&600
Other Chrono Testing (Different upper - testing in Pennsylvania):
28 gr. H4895, BR-4 primer, Berger 105 VLD, in lands .010", MV 2740, ES 26, SD 11
28.5 gr. H4895, BR-4 primer, Berger 105 VLD, in lands .010", MV 2794, ES 17, SD 7
29 gr. RL 15, BR4 primer, Berger 108 BT, in lands .012", MV 2778, ES 9, SD 3
29.5 gr. RL 15, BR-4 primer, Berger 108 BT, in lands .012", MV 2834, ES 23, SD 7
29.5 gr. Varget, BR-4 primer, Berger 108 BT, in lands .010", MV 2735, ES 7, SD 3
30 gr. Varget, BR-4 primer, Berger 108 BT, in lands .010", MV 2773, ES 24, SD 9
30.5 gr. Varget, BR-4 primer, Berger 108 BT, in lands .010", MV 2826, ES 9, SD 4
30 gr. N540 (2004 Lot), BR-4 primer, Berger 105 VLD, in lands .010", MV 2806, ES 19, SD 3
30 gr. N540 (2007 Lot), BR-4 primer, Berger 105 VLD, in lands .010", MV 2857, ES 13, SD 4
30.5 gr. N540 (2007 Lot), BR-4 primer, Berger 105 VLD, in lands .010", MV 2906, ES 21, SD 7
A 6mmAR (Left) vs the new 6mmAR Turbo 40° Improved (Right)
Close Up of Turbo 40 side charging handle option with rigid heavy walled DPMS
Low Pro upper receiver
Copyright 2005 Robert Whitley. All rights reserved.
