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

 

[alexnelon]

So you prefer N150 over N540?

There's some tradeoff. Single vs double base powders, 540 will gain some speed, but probably be a little less temp stable.

N150 is extremely consistent, if a touch slow. Very very popular with competition shooters in some of the 6's.

 

[JDMBEND]

Sierra is now shipping the 6mm 105’s. Hopefully next is the 116’s.

 

[wind gypsy]

Sierra is now shipping the 6mm 105’s. Hopefully next is the 116’s.

Standard SMKs right?

 

[Finaddictions]

Standard SMKs right?

Yeah, the new SMK’s. The new TMK’s aren’t supposed to be to far away.

 

[JDMBEND]

Standard SMKs right?

105 smk’s

 

[Schmo]

Yeah, the new SMK’s. The new TMK’s aren’t supposed to be to far away.

Is the best place to watch for them on Sierra’s site?

 

[KyleR1985]

They released a video with a general outline of when to expect bullets to be available.

It seems to be accurate so far. I posted it back a few pages. It’s on sierras YouTube channel.

 

[Finaddictions]

Is the best place to watch for them on Sierra’s site?

It's definitely a great place to check to see what's in stock, but I'd also watch Unknown Munitions site. I think they're going to be one of the first in the country to see product.

 

[Formidilosus]

6 deer today so far with 116gr TMK’s. Impacts from 2,589fps to 2,170fps. Wound channels are excellent so far.

 

[Matt5266]

6 deer today so far with 116gr TMK’s. Impacts from 2,589fps to 2,170fps. Wound channels are excellent so far.

Are you going to be doing any with the 107?