Sierra Heavy TMK 6MM Testing

[IrkedCitizen]

Sideways impacting bullets already has the tumble initiated....

 

[Formidilosus]

Curious how the BC holds up in practice at extended distances, especially at low DA.

At 4,000ft DA .609 G1 is spot on at 800y in that rifle.

 

[Formidilosus]

What about the guys with bullets going sideways through the paper? Probably isn’t working for them lol

No. Which is why “DA and weather matters”. Not just blanket “you need X”.

An 8” twist at western US DA’s is not an issue at all. A 7.5” twist at -3,000ft DA was no issue either for two different barrels.

 

[Formidilosus]

Sea level on a cold day?

Probably not a good idea with an 8” twist. DA matters. 2x 7.5” twist barrels were just fine at -3,000ft DA back in February however.

 

[IrkedCitizen]

UM just posted on IG that they have 25cal 135gr, 7mm 185gr, and .22 77gr tmks in stock

 

[mustelid_master]

No. Which is why “DA and weather matters”. Not just blanket “you need X”.

An 8” twist at western US DA’s is not an issue at all. A 7.5” twist at -3,000ft DA was no issue either for two different barrels.

negative 3000ft DA?

 

[MEdude]

-3000 Happen on the coast of Maine every winter…