Sierra Heavy TMK 6MM Testing

[Schmo]

Huh, didn't know they issued TMK ammo at all. Interesting and thanks for sharing.

What do you think the 77 TMK was designed for? Hint: two legged targets. Marketed as a “match” bullet so that it’s useable. It’s not a “hunting” bullet

 

[wind gypsy]

What do you think the 77 TMK was designed for? Hint: two legged targets. Marketed as a “match” bullet so that it’s useable. It’s not a “hunting” bullet

I've been loading TMKs since they were released in 2015, started primarily with 77s from an AR. I had never heard that claim until recently on this forum. Have always known that they perform well in that regard but never that they were designed for it. Got receipts?

Lots of 77, 6.5, 168, 175 SMKs used in matches and these were a higher BC version so its not like they didn't make sense as a match bullet.

 

[Schmo]

I've been loading TMKs since they were released in 2015, started primarily with 77s from an AR. I had never heard that claim until recently on this forum. Have always known that they perform well in that regard but never that they were designed for it. Got receipts?

I wouldn’t want to put words in his mouth, but Form eluded to this on a podcast.

 

[doc holiday13]

I wouldn’t want to put words in his mouth, but Form eluded to this on a podcast.

The whole bullet thing has been more or less hush hush in industry and military. Look at the original twist rate on the AR platform 1:14. 55g bullets would upset upon contact and thats where you got the "bullet tumble killing" of Vietnam.

First deer with a 77g OTM solidified it in my mind that the design intent on those bullets was apparent. 69g mean greenies(green tip steel core) are mostly for punching through obstacles to hit target on the opposite side but that hard impact will still cause a level of disruption.

 

[Undrgrndprdcts]

Can we get these going fast enough out of an 18" 6 creed? What powder?

 

[The Guide]

Can we get these going fast enough out of an 18" 6 creed? What powder?

Post in thread 'Sierra Heavy TMK 6MM Testing' https://rokslide.com/forums/threads/sierra-heavy-tmk-6mm-testing.431797/post-4503635

 

[Undrgrndprdcts]

Post in thread 'Sierra Heavy TMK 6MM Testing' https://rokslide.com/forums/threads/sierra-heavy-tmk-6mm-testing.431797/post-4503635

I wonder what powders? H4350?

 

[Jake Larsen]

Can we get these going fast enough out of an 18" 6 creed? What powder?

Fast enough for what? Out of a 16.5” (2700 FPS) they’re an 800 yard gun at my average DA. Based on other testing numbers, even 2800 should be possible with a 16.5”.


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[Undrgrndprdcts]

Fast enough for what? Out of a 16.5” (2700 FPS) they’re an 800 yard gun at my average DA. Based on other testing numbers, even 2800 should be possible with a 16.5”.


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I just meant to be efficient. Looks like that has been answered as yes already.

 

[JDMBEND]

Fast enough for what? Out of a 16.5” (2700 FPS) they’re an 800 yard gun at my average DA. Based on other testing numbers, even 2800 should be possible with a 16.5”.


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Sounds reasonable.

 

[Jake Larsen]

I just meant to be efficient. Looks like that has been answered as yes already.

As long as you’re got 1800 fps, the TMKs are very efficient killers. I’ll be slowing these down personally, 2650-2700fps gives me reliable expansion at 600 yards and under. That’s all I need for hunting purposes, and I’d rather have a milder load.


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[KyleR1985]

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This is for you guys talking about finicky bullets. They’re far from finicky. Top one is 115’s, middle is 116 and bottom is the 117’s.

This is with zero load work up from a 6 Dasher. I used my PRS load, but dropped .2 grains just to hopefully gain a little head room for the heavier projectiles. I used 30 grns of Varget, seated them using the same die setting as the 110 SMK, (which I seat so the bottom of the bearing surface is at the neck shoulder junction). These were the first 3 10 shot groups testing to see how accurate these bullets might be.

As an aside, I haven’t changed that seating die across a bunch of projectiles and it’s always worked, and the bottom of the bearing surface is generally right at the neck shoulder junction. These heavies extended a bit below that though.

You tell me, but they look plenty accuracy capable. I wouldn’t call those finicky in any way.

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I couldn’t seem to find if you posted velocity on the dasher testing, and your barrel length. Did you record it?

 

[Finaddictions]

I couldn’t seem to find if you posted velocity on the dasher testing, and your barrel length. Did you record it?

Sadly I went back and looked and I don’t find where I wrote it down. I know they weren’t fast because I loaded them with 30grns of Varget. I think I have 10 of the 117’s load left. I’ll try and shoot them tomorrow and give you a speed but I imagine it was in the mid 2600’s.