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Will a 1 in 8 twist?

 
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  #1  
Old 12-24-2006, 01:34 PM
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Will a 1 in 8 twist?

Stabilize a 90 gr 224 bullet? Coming out of a 22-250AI
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Old 12-24-2006, 03:18 PM
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Re: Will a 1 in 8 twist?

Assuming you're talking about Sierra, barely.
But you may lose it in freezing temps, at low altitudes.
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Old 12-24-2006, 03:22 PM
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Re: Will a 1 in 8 twist?

Give it a try.The sierras stablized in my 22 br 8 twist just fine at 3000 fps.
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Old 12-24-2006, 04:07 PM
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Re: Will a 1 in 8 twist?

I believe that you may have some chance of stabilising the 90 grain Sierra MK, (about 1.160 inches)but getting eneough rpms to shoot accurately may be a problem.

I believe that you have no chance of stabilising enough to get accuracy with 90 grain bullets from JLK (1.225 in) or Berger (about 1.250)with the 8 twist barrel.

A few that I know found that the 90 grain JLK at about 3,500 from 22/6mm AI, would just stabilise, but accuracy was terrible.

A custom bullet maker told me about 5 years ago, that his experiments showed that the Krieger 7.7 twist was the minimum when using the 90 grain JLK in his 22/243 Middlestead.

I chronographed bullet weights from 65 - 100 grains in my 22/250AI to see what velocities the case was capable of producing. I got about 3,100 - 3150 fps with the 90 grain Sierra MK in a Shilen 24.5 inch 1 in 10 twist barrel. (Obviously they keyholed into target)

Hope that the above is of some help. Brian.
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Old 12-24-2006, 09:05 PM
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Re: Will a 1 in 8 twist?

Thanks you all. Looks like I just play with 75 and 80 gr A-Maxs.
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