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6 dasher is 7 twist too much

ranger3

I'm looking at building a 6 Dasher and when I went to buy the barrel in 8 twist. All that is currently available is 7 twist. I'll be shooting mainly Sierra 107's, Berger 105 hybrid, Hornady 108's, but had hoped to shoot shorter bullets as well. Wondering if anyone has any experience with a 7 twist 6 Dasher, accuracy with a range of bullets.
 
I called Sierra and Hornady and Berger and they all said no problem it just seems like such a Big jump. I used the twist stability calculator by Berger which says it's good so my worry seems to be for nothing. It's just not going to be a Twist that works for 58 or 65 or maybe even 87 grain bullets.
 
I sure hope it works. I got a 7 twist benchmark on mine. just waiting on my EH1 then I can start load development. I went 7 twist so I have the option to shoot the 101 Hammer Hunter as this gun will be used for deer hunting. But will mostly use 105 Bergers.
 
I’ve got a 7 twist on a 6BRA. Barrel only has about 80 rounds on it. Shot 105’s, 107’s and new 110 Hornady’s thru it and all have shot excellent. Nothing to complain about.

Later, Frank
Bartlein Barrels
 
My Curtis Vector is wearing a Hawk Hill 7 twist chambered in 6 Dasher. I shoot 105 VLDs and Target, same as with my 7.5 twist BR barrels.
The performance that 7 twist displays is proof enough to me that it's not too much twist, especially if you should find the 110 SMK or the 115 DTAC to your liking.
 
I have a friend with a 7” Dasher and it’s a hammer! My BRX on a 7.3” Broughton is one of the best barrels I’ve ever had.
 
My current Dasher barrel is 7 twist and shoots great with 105 Hybrids. I chose it thinking I’d shoot DTACS but the 105’s have performed better so I’m shooting those.
 
One thing being left out of the discussion is the shooter's elevation. That seems to have quite an effect on what twist rate is right.
I am usually around 4-500' ASL. Using Berger's twist rate calculator(2900 FPS @ 85 degrees) the 105 VLD is 2.17 but when that goes to 3,500 ASL the factor goes up to 2.43 using all other same inputs. Then, at 6,000 ASL the factor is 2.67. The one thing that I have never seen from the Berger program is a warning of just what factor starts to get you into bullet blowup range.
Ti would be interesting to see if my rifle would blow up bullets out in the higher elevations of CO or, for that matter, in 100+ temps in higher altitudes of AZ.
Then again, maybe I just misunderstand the whole purpose of the program?
 
shoot4fun said:
One thing being left out of the discussion is the shooter's elevation. That seems to have quite an effect on what twist rate is right.
I am usually around 4-500' ASL. Using Berger's twist rate calculator(2900 FPS @ 85 degrees) the 105 VLD is 2.17 but when that goes to 3,500 ASL the factor goes up to 2.43 using all other same inputs. Then, at 6,000 ASL the factor is 2.67. The one thing that I have never seen from the Berger program is a warning of just what factor starts to get you into bullet blowup range.
Ti would be interesting to see if my rifle would blow up bullets out in the higher elevations of CO or, for that matter, in 100+ temps in higher altitudes of AZ.
Then again, maybe I just misunderstand the whole purpose of the program?
Click to expand...
It's quite funny you said that bought Berger 55grain 20 caliber back in the day recommendations was an 8 twist I was shooting 20x47 lapua at 3920 fps at 700 ASL an proof bullet blows up made a 9 twist guess what happy camper.Thanks for your comment.
 
shoot4fun said:
One thing being left out of the discussion is the shooter's elevation. That seems to have quite an effect on what twist rate is right.
I am usually around 4-500' ASL. Using Berger's twist rate calculator(2900 FPS @ 85 degrees) the 105 VLD is 2.17 but when that goes to 3,500 ASL the factor goes up to 2.43 using all other same inputs. Then, at 6,000 ASL the factor is 2.67. The one thing that I have never seen from the Berger program is a warning of just what factor starts to get you into bullet blowup range.
Ti would be interesting to see if my rifle would blow up bullets out in the higher elevations of CO or, for that matter, in 100+ temps in higher altitudes of AZ.
Then again, maybe I just misunderstand the whole purpose of the program?
Click to expand...
I don’t think the two are connected. Stability is affected by the air density, but blow ups would be purely an issue with rpm and centrifugal force.
 
Im running a Krieger 5R 1:7 twist with zero issues on my Dasher. Been shooting 105 RDF, 105 Hybrids, 105 Gungnirs and 115 RDFs all shoot great.
 
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