Sierra Heavy TMK 6MM Testing

[KyleR1985]

whats your twist rate?

1:7.

88’s were just under 2700 fire forming over 26gr lever.


Everything has shot small so far

 

[Gstew1930]

1:7.

88’s were just under 2700 fire forming over 26gr lever.


Everything has shot small so far

Thats what i wanted to hear lol

 

[Schmo]

Can’t speak to any of the loaded ammo, but the cases can take higher pressure & they said that due to the construction, they have additional powder capacity. That would mean an additional 2 grains of powder in 223/556. They can’t be reloaded. I havnt received the 250 cases I ordered yet, but will update when I do. I’m already getting 2800 fps from my 16” bbl (1/7, .100 fb) with 80’s and N150 in ADI brass.

N150 is one of the overlooked powders for this use case. As well as N540. Everyone wants to use 8208XBR. Sure it works, but velocities are very low with heavies when using it

 

[N2TRKYS]

Cant wait to try the 153 tmk in the 6.5 prc.....

Me too. I’m anxiously waiting on reports from the testing.

 

[mtnbound]

N150 is one of the overlooked powders for this use case. As well as N540. Everyone wants to use 8208XBR. Sure it works, but velocities are very low with heavies when using it

So you prefer N150 over N540?

 

[Schmo]

So you prefer N150 over N540?

Have not tested the N540 yet, but I think it may give more speed. It’s a hotter powder. It should be close anyway