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.
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 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
There are a number of powders that have been tested and work well with the
Turbo 40, among them:
IMR 8208 XBR
Hodgdon CFE 223
Alliant Reloder 15
Accurate AA2520 (ball powder)
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 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.
Some suggested loads (using already fire formed brass) with bullets between 80-108 gr:
28 gr IMR 8208 XBR or H4895
28.5 gr. RL15, or N140, or N540
29 gr H335
29.5 gr AA 2520
31 gr CFE 223
32 gr Alliant 2000-MR
For fire forming with virgin brass try:
26 gr. IMR 8208XBR
27 gr. H4895 or H335
28 gr. RL15, or N140, or 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 2800 - 2900 fps range with powders like Hodgdon H335, Hodgdon CFE 223, Alliant 2000-MR, Alliant RL15, Norma 203B, VV N540, Hodgdon H4895, IMR 8208 XBR.
Varget - - PLEASE NOTE we do not recommend the use of Varget in the T-40 cartridge. Not only is Varget bulky in the cartridge but a number of customers have reported pressure problems using that powder.
26" Barrel Chrono Testing (testing in Pennsylvania, 65˚ F)
Barrel is 26" Krieger barrel. All Loads loaded magazine length (2.260" OAL) and fired magazine fed.
Loads with H335:
29 gr. H335, Berger 108 gr Boat Tail @ 2.260" OAL - 2756 fps - no pressure issues
30 gr. H335, Berger 108 gr Boat Tail @ 2.260" OAL - 2836 fps - slight pressure signs
Loads with H4895:
28 gr. H4895, Berger 108 gr Boat Tail @ 2.260" OAL - 2708 fps - no pressure issues
29 gr. H4895, Berger 108 gr Boat Tail @ 2.260" OAL - 2806 fps - slight pressure signs
Loads with IMR 8208 XBR:
28 gr. IMR 8208 XBR, Berger 108 gr Boat Tail @ 2.260" OAL - 2711 fps - no pressure issues
29 gr. IMR 8208 XBR, Berger 108 gr Boat Tail @ 2.260" OAL - 2793 fps - slight pressure signs
Loads with Hodgdon CFE 223:
31 gr. CFE 223, Berger 108 gr Boat Tail @ 2.260" OAL - 2792 fps - no pressure issues
32 gr. CFE 223, Berger 108 gr Boat Tail @ 2.260" OAL - 2867 fps - slight pressure signs
Loads with Alliant 2000-MR:
32 gr. 2000-MR, Berger 108 gr Boat Tail @ 2.260" OAL - 2811 fps - no pressure issues
32.5 gr. 2000-MR, Berger 108 gr Boat Tail @ 2.260" OAL - 2869 fps - no pressure issues
A 6mmAR (Left) vs the new 6mmAR Turbo 40° Improved (Right)
Copyright 2005 Robert Whitley. All rights reserved.