Popapi
Well-Known Member
Guys which would you go with and why. I'll be doing a build to shoot 140 to the 180VLDs.....also would you go with a 8.5 or 9 twist? Thanks for your advice!
Krieger 4groove or Bartlein 5R for 7STW build?
- Thread starter Popapi
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FearNoWind
Well-Known Member
Bartlein 5R 9 twist ....
Shoots those 180 grain Berger VLDs like nothing else. Of course, the 8.5 wouldn't be an especially bad choice either - depending on your choice of bullets.
Shoots those 180 grain Berger VLDs like nothing else. Of course, the 8.5 wouldn't be an especially bad choice either - depending on your choice of bullets.
FearNoWind
Well-Known Member
Bartlein 5R with 9 twist ....
Shoots those 180 grain Berger VLDs and the 150 grain Barnes LRX like nothing else. Of course, the 8.5 wouldn't be an especially bad choice either - depending on your choice of bullets.
Shoots those 180 grain Berger VLDs and the 150 grain Barnes LRX like nothing else. Of course, the 8.5 wouldn't be an especially bad choice either - depending on your choice of bullets.
MudRunner2005
Well-Known Member
Gotta agree 100%. 26" or longer Bartlein 5R 9" twist.
If you plan to ever shoot the Berger 195 EOL's (when available) or Matrix 190's, I would go with the 8.5" twist.
If you plan to ever shoot the Berger 195 EOL's (when available) or Matrix 190's, I would go with the 8.5" twist.
Popapi
Well-Known Member
Was just wondering the guy at Kroger told me to consider a 8.5 for the 180s, but always been a fan of the Bartlein!
MudRunner2005
Well-Known Member
At 500' above sea level on a 40* day a 9.25" twist can spin a Berger 180 Hybrid in a 7mm STW....
Done it.....A BUNCH.
Spinning and properly stabilizing aren't the same thing. When someone asks for a recommendation, they deserve an accurate one. At 500' above sea level on a 40* day an 8.75" - 9.00" is about the minimum. You would need 3650 FPS to get to an SG of 1.5 with a 9.25" twist.
Popapi
Well-Known Member
So I can't go wrong with either for 180s on down right guys?
MudRunner2005
Well-Known Member
You aren't "everybody" and the Berger calculator supports what someone at Krieger said.
Since there is no downside to using an 8.5" vs a 9" or a 9.25" , the better choice would be an 8.5"
MudRunner2005
Well-Known Member
WildRose
Well-Known Member
If it were me and I was going to shoot the heavies I would go with an 8 or 8.5 twist. It doesn't cost any more to go with an 8 and it will not hurt your accuracy if you choose to shoot the lighter bullets as well.
Yup. You can guess and take your chances, or you can calculate the proper twist rate using the best science available, and have much better odds of ending up with the twist rate that will stabilize your bullets at sea level in frigid temperatures, or at 10,000' elevation, in shirt sleeves.
