New TMK announced

[nm.otter]

115 TMK - 109 ELD - 109 Hybrid - 115 DTAC

Even longer than the 109s -- should seat nicely in 6mm GT.

 

[khuber84]

Even longer than the 109s -- should seat nicely in 6mm GT.

115 dtacs need 0.200 freebore in the 6GT in my opinion. The 6gt has a longer neck than the creed, so the creed should probably be around 0.220 optimally for the dtac.

 

[CBB1]

So for a 1:8 243 would the 107 be the ideal bullet? Would there be any noticeable differences above the 95TMK for 500 yards and in on whitetail size game?


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[Lawnboi]

@Carl Ross

Shoot the 115s in a dasher? Barrel twist and freebore?

 

[justin davis]

Think the new 88 TMK will stabilize ok out of a 1-8 twist 22 creed?

 

[43.6N]

Think the new 88 TMK will stabilize ok out of a 1-8 twist 22 creed?

I personally think 20” or longer 22 creed will get them fast enough to stabilize with a 1:8.
Shorter will probably find 1:7 or 7.5 will be better.

 

[PathFinder]

Roger that. I’ve got the standard cut NR’s and have been curious to see how they’d act on deer/goats/bears as it sounds like maybe they wouldn’t have the chance to do the same amount of damage that they would on an elk, maybe acting more like a mono on those smaller animals?

My experience with them has been positive overall. Granted most of it was with a 6 UM at 3400 mv, but they did well out of the 243 Improved too. A couple wounds with slightly longer necks, but nothing that left room to question lethality.

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[amassi]

Think the new 88 TMK will stabilize ok out of a 1-8 twist 22 creed?

I asked AI to compare the existing TMK line and guess at the length and BC of an 88 and it guessed
Bc: .510-.545
Length: 1.19-1.25”

Berger suggests stability :
1.28 w/ 1:8.
1.46 w 1:7.5
1.67 W 1:7

59* and 1000’ 3150 fps

You’d need to go to 6,800’ for 1:8 to get above 1.5 sg


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[Carl Ross]

@Carl Ross

Shoot the 115s in a dasher? Barrel twist and freebore?

Not sure if you mean the DTAC's or these new bullets.

Never shot the DTAC's extensively.

Will be shooting these TMK's in a Dasher tomorrow, if all goes well.

 

[Lawnboi]

Not sure if you mean the DTAC's or these new bullets.

Never shot the DTAC's extensively.

Will be shooting these TMK's in a Dasher tomorrow, if all goes well.

Talking the new tmk. Let us know how it goes please.

I’d like to shoot them in my hunting dasher if a 7.5 twist will spin them

 

[KyleR1985]

Talking the new tmk. Let us know how it goes please.

I’d like to shoot them in my hunting dasher if a 7.5 twist will spin them

What barrel length is your gun?

 

[SouthPaw]

I asked AI to compare the existing TMK line and guess at the length and BC of an 88 and it guessed
Bc: .510-.545
Length: 1.19-1.25”

Berger suggests stability :
1.28 w/ 1:8.
1.46 w 1:7.5
1.67 W 1:7

59* and 1000’ 3150 fps

You’d need to go to 6,800’ for 1:8 to get above 1.5 sg


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Given the geometry difference between most TMKs and ELDMs, I'm guessing the 88gr TMK won't be as aggressive nose/ogive as the 88gr ELDM. Which means, theoretically speaking, BC likely a little lower than .545 G1 of the ELDM. I'd assume it should work well in 7 and 7.5, 8 is velocity/DA dependent.

But, also likely, AI > me.

 

[Lawnboi]

What barrel length is your gun?

21”

 

[nm.otter]

115 dtacs need 0.200 freebore in the 6GT in my opinion. The 6gt has a longer neck than the creed, so the creed should probably be around 0.220 optimally for the dtac.

Longer neck, yes-- but .185" shorter case should allow more room out front in an M+ mag, no?

 

[khuber84]

Longer neck, yes-- but .185" shorter case should allow more room out front in an M+ mag, no?

A 6cm with a dtac touching lands is only 2.810, they have a really short nose. The m+ mags are 2.980 internal. LOTS of room.

 

[nm.otter]

I keep thinking of some sort of 6mm bore rider design for GT.

 

[khuber84]

I keep thinking of some sort of 6mm bore rider design for GT.

Why bore rider? Stepped throats or +P is a poor trade off of a lil extra velocity in trade for a throat that moves 2-3x faster than a conventional 1.5° lead angle. The 6gt performs very admirably for its 44gr size. This new 107tmk will be a great bullet for it, with its short bearing, it'll run 50-70fps faster than a 108eldm, have near same BC but will percorm to much lower impact velocity if these new bullets share traits with the 77tmk.

 

[nm.otter]

I'm an engineer who's learning to shoot -- You're probably three levels above my pay grade on this

My thinking was: shorter case allows longer bullet in same COL & mags. Bore rider allows potentially higher MVs versus a super long bearing surface.

 

[ACHILLES]

Just do a 6cm over a 6GT plus p for the reasons khuber mentioned. And you’d save the $200 for the plus p process.

 

[khuber84]

Just take the 6gt for what it is, near 6br accuracy and super easy load development, but a lil slower mv VS the creed/xc/x47. The decision a guy needs to make is barrel length, and velocity desired with X bullet, this tells you case size needed.

For reference a 21in 6gt will still run heavy for cal bullets at 2800+ mv, which is where 18" 6cm usually run. It's a very efficient case, especially in shorter barrels. 21 is the shortest I've gone with one.