Sierra Heavy TMK 6MM Testing

[eric1115]

They have the 116 listed as a .609 G1, seemingly higher than you guys were getting by shooting. Do we know if that's a real Doppler tested number? Or an optimistic number? .574 on the 107 seems similarly above what I thought we were expecting. Not that it necessarily matters all that much, just idle curiosity while I wait for stuff to become available.

 

[cq0302]

Any terminal testing beyond the cow elk earlier in the thread?


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[Formidilosus]

They have the 116 listed as a .609 G1, seemingly higher than you guys were getting by shooting. Do we know if that's a real Doppler tested number? Or an optimistic number? .574 on the 107 seems similarly above what I thought we were expecting. Not that it necessarily matters all that much, just idle curiosity while I wait for stuff to become available.

I believe that is Doppler numbers. Both are. With more shooting I was getting right at .600 G1 live fire. 10 points is definitely in the realm of error for live fire.

 

[Formidilosus]

Any terminal testing beyond the cow elk earlier in the thread?

Not much. Should have a bunch more soon.

 

[Formidilosus]

16” 223 factory 1-8” twist barrel.

Test 88gr TMK’s. LC brass, crimped primers. 21gr 8208 XBR, 2.460” coal. DA was 2,450ft today.


Stabilized just fine.

 

[Dude270]

Thats good news on the 88s. I wondered if they would work in an 8 twist 223

 

[2Stamp]

Thats good news on the 88s. I wondered if they would work in an 8 twist 223

That's what he tested them with.

 

[cq0302]

16” 223 factory 1-8” twist barrel.

Test 88gr TMK’s. LC brass, crimped primers. 21gr 8208 XBR, 2.460” coal. DA was 2,450ft today.


Stabilized just fine.
View attachment 1010666

This is good news, I have had issues with the 88eldm in a 1:8 where the groups fell apart at distance


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[cq0302]

16” 223 factory 1-8” twist barrel.

Test 88gr TMK’s. LC brass, crimped primers. 21gr 8208 XBR, 2.460” coal. DA was 2,450ft today.


Stabilized just fine.
View attachment 1010666

Should be a nasty pill at 3000-3100 out of a 250


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[Formidilosus]

Should be a nasty pill at 3000-3100 out of a 250


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We’ll know in the next week. Have a culling trip. 88gr .224, 107gr and 115/116/117gr 6mm, and 153gr 6.5mm.

 

[KyleR1985]

16” 223 factory 1-8” twist barrel.

Test 88gr TMK’s. LC brass, crimped primers. 21gr 8208 XBR, 2.460” coal. DA was 2,450ft today.


Stabilized just fine.
View attachment 1010666

Did you measure/can you share the bullet length?

 

[ACHILLES]

And the length of the tip as well please if you can share it

 

[West2East]

And the length of the tip as well please if you can share it

You always include the tip! That's the most important part!

 

[Jordan Smith]

This is good news, I have had issues with the 88eldm in a 1:8 where the groups fell apart at distance


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At distance, as in, the transonic zone?

When dealing with marginal stability, DA can make or break you.

 

[pathnz]

At sea level the 88 eldms were tumbling for me at 2450 fps from 1:8. SG is like 1.15

 

[Schmo]

much better and consistent supply.

Is there any chance that means when these new TMKs come in stock in mid March that there might be enough of them?

 

[cq0302]

At distance, as in, the transonic zone?

When dealing with marginal stability, DA can make or break you.

Yes, low DA, definitely not transonic, 3500mv. they grouped well at 100 ~1.2”, but then at 700 they were greater than 2moa. While the 80s and 85.5s held moa or better. To me this was indicative of poor stability. They were marginal to start with and this was indicative the summer when da was ~2000, which is on the higher end for my local. ~3500-4000 is as high as I’ve seen it. I figured during hunting season they wouldn’t stand a chance so I gave up on the load. Maybe I interpreted the outcome wrong but I’m confident it wasn’t the gun or myself based on what I saw from the 80s and 85.5s

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[Formidilosus]

Is there any chance that means when these new TMKs come in stock in mid March that there might be enough of them?

Yes. Good chance.

 

[Jordan Smith]

At sea level the 88 eldms were tumbling for me at 2450 fps from 1:8. SG is like 1.15

Obviously, the true SD is < 1.