Base Case: 6.5 Grendel

Modification Method:

               Neck Down & Fire Form

Shoulder: 40˚ Ackley type

Water Capacity:
Max Case Length:
Trim Length:

Suggested Powders:

 - Hodgdon H4895

 - IMR 8208 XBR
 - Hodgdon H335
 - Hodgdon CFE 223
 - Alliant 2000-MR
 - Alliant Reloder 15
 - VihtaVuori N540
 - VihtaVuori N140
 - Accurate AA2520 (ball powder)

Dies Available.

Uppers Available

Cartridge is Proprietary

Turbo 40

Quick Facts

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 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!

6mm AR Turbo 40˚ Improved

Aka The Turbo 40˚

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

For fire forming with virgin brass try:
 - 26 gr. IMR 8208XBR
 - 27 gr. H4895 or H335
 - 28 gr. RL15, or N140, or N540

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.

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.

  26" Barrel Chrono Testing

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).

AccuRacy is Excellent!!

rcw3@erols.com  -  215-348-8789

199 North Broad Street, Doylestown, PA, 18901

The listed loads on this site 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.

Above = 10 Shot Slow Prone Testing Group With Turbo 40°

The 6mmAR Turbo 40˚- Easy to Make!

Ar-X/ 6mmAR.com

Right = Additional 10 Shot Slow Prone Testing Group With Turbo 40° @ 100 Yards

- Shot Slow Prone With Sling

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.

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 NOTEwe 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.

Above: Turbo40 (left)

            6mmAR (right)

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

Warning

on Loads & Loading

Barrel is 26" Krieger.

All Loads loaded magazine length (2.260" OAL) and fired magazine fed.