Sierra Heavy TMK 6MM Testing

[Schmo]

The sierra site says available mid-March and given their availability issues in the past I would assume even that date is optimistic.

I’m hopeful that the new leadership will be able to hold to that timeline

 

[KyleR1985]

Based on my correspondence with Sierra, I would expect staggered delivery of the new TMK’s, following which ones get design/testing done first.

While I can’t speak to when bullets actually get produced and shipped - 6mm 107’s and 6.5mm 153’s will get run first, with .25’s, 6mm 116’s, and .22 88’s to follow loosely in that order.

 

[wind gypsy]

131 TGK might be a nice bullet for fast quarterbores too.

 

[Schmo]

131 TGK might be a nice bullet for fast quarterbores too.

Gross

 

[dreamingWest]

Any chance a 10 twist 243 would stabilize the 107s?

 

[Carl Ross]

Any chance a 10 twist 243 would stabilize the 107s?

You’d have a decent chance…at 12,000 ft in July.

For general use, no.

 

[eric1115]

Any chance a 10 twist 243 would stabilize the 107s?

No, especially if they are as slippery as advertised. 95 TMK is your huckleberry.

 

[wind gypsy]

No, especially if they are as slippery as advertised. 95 TMK is your huckleberry.

Even that might be marginal. Sierra calls for 1:9 min twist.

 

[eric1115]

Even that might be marginal. Sierra calls for 1:9 min twist.

That's true, but it does seem like they set that twist spec to be able to shoot a 6x45 in Death Valley at -20°F.

Still, @dreamingWest you should probably buy 100, not 1k to start.

 

[dreamingWest]

If I end up with 10 twists 243s, I'll just stick with NBTs.

I'm shopping a lefty 6mm for my son and a righty for myself this year. I'm hoping for easy button no gunsmith necessary options from Tikka or Browning. Watching Shot Show releases this week.

 

[blacktailcentral]

131 TGK might be a nice bullet for fast quarterbores too.

How much of a difference in expansion between the tgk and tmk?