Sierra Heavy TMK 6MM Testing

[Jordan Smith]

Getting ready to order a 6cm barrel for my tikka.. What's the optimal twist rate for these new 116's?

I'd go 7".

 

[huntsd]

Tikka factory Roughtech 1:8” 243win cut to 16”.

116gr TMK-
View attachment 1028475



107gr TMK-
View attachment 1028476

@Formidilosus any thoughts on 4831sc for these using a 243?

 

[Formidilosus]

@Formidilosus any thoughts on 4831sc for these using a 243?

That’s next.

 

[huntsd]

That’s next.

looking forward to it

 

[5MilesBack]

That’s next.

H1000 too??? I have a bunch of H1000 and H4350.

 

[Axlrod]

@Formidilosus any thoughts on 4831sc for these using a 243?

I'm on my second 8# jug of H4831sc in 243's & 243 AI w/CCI 250's and 105 grain bullets. It gives me 80-100 fps more than H4350 and shoots better than any powder I have tried in those guns. (it's my favorite in 280AI & 416 Rigby too).
6.5 Staball will get nearly another 100 fps over 4831, but my groups were about double the size.

 

[PathFinder]

H1000 too??? I have a bunch of H1000 and H4350.

H100 is on the top end for burn rate, but works well. That's what I'm using in a 243 Improved. Probably start around 46 grains and work up. Theoretically, it should allow for much longer barrel life.