Sierra 6.5 140 SBT GameKing

[lutheran]

Will the Sierra 6.5 140 SBT GameKing stabilize in a 6.5x47 Lapua with a 9" twist?

Thanks
lutheran

 

[jonbearman]

I think 8 twist is the twist that most guys use,however I would try it being that 9 twist is so close.Most .308's are 1 ni 12 and they stabilize 190 grain bthp's. The worst that could happen would be inaccuracy. Check berger bullets web site and they have a chart regarding twist rate.Alot of times a lesser twist will stabilize just fine.

 

[bheadboy]

my 6.5-06 handled 129hor and 140si in a 9 twist douglas premium

Bob

 

[bowslngr]

9 twist is enough. The 140 SGK is not very long for its weight.

 

[2644ever]

I had a Shilen 8 groove in 9". It would stabilize the 140 Matchking but not the Hornady 140 A-Max or the Lapua Scenar 139.

 

[louielouie]

With a length of 1.264" (32.03mm) the JBM Stability calculator indicates that a 1:10 twist rate would still be in the 'green' for a variety of atmospheric conditions.

 

[lutheran]

Had the chance to try the 140 Sierra SBT's in the 9" twist. They shot very well. Thanks for the posts on the subject.

The load was 40gr H4350/CCI450 primer/24" barrel/6.5x47 Lapua. Hoping someone might know the velocity as I do not have a chronograph.

lutheran

 

[BoilerUP]

I've got a few of these to load up for my 22" 9 twist R700 Mountain LSS in .260; while they have been effective I figure it wouldn't hurt to have a little more "oomph" over the 120 Nosler BT.

 

[ARshuter]

Had the chance to try the 140 Sierra SBT's in the 9" twist. They shot very well. Thanks for the posts on the subject.

The load was 40gr H4350/CCI450 primer/24" barrel/6.5x47 Lapua. Hoping someone might know the velocity as I do not have a chronograph.

lutheran

In my gun 26" Douglas in 8 twist I get 2800 with 40.0 of H4350 and Sierra 140's 2850 with 41.0 grains. HTH

 

[lutheran]

Thanks ARshuter. This rifle is just a hunter on a 700 with a Pac-Nor #4 in an HTG and a Jewel trigger but I'm still tickled at how well it shot this combination.

lutheran

 

[ARshuter]

Mine will hammer this combo. Sunday I shot a 197 with 12X at a midrange match, which was the first match I shot the gun in. That was with 40.0 grains. I shot those (40.0 grainers) just to get rid of the ones I had, it shoots 41.0 grains better at distance.