The Accurate Reloading Forums
Twist rate?

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14 January 2007, 23:03
cmfic1
Twist rate?
Hey guys/gals, I am wanting to build a .280 A.I. & was wondering what would be the optimum twist rate? I will likely for the most part be loading 140gr. bullets.

Thanx.


Rod

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"A hunter should not choose the cal, cartridge, and bullet that will kill an animal when everything is right; rather, he should choose ones that will kill the most efficiently when everything goes wrong"
Bob Hagel
15 January 2007, 06:14
Buliwyf
I recommending telephoning the barrel maker and talking with the technical staff. Critical information to the success of your project - get this answer straight from the horse's mouth, so to speak.
15 January 2007, 07:29
smedley
cmfic1 take a look HERE.


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Smedley

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"..it does not require a majority to prevail, but rather an irate, tireless minority keen to set brush fires in people's minds.." Samuel Adams
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Facts are immaterial to liberals. Twisted perceptions however are invaluable.
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15 January 2007, 07:43
Cossack2
I hope that this doesn't come as a surprise but AIing the 280 will likely not get you more than 100 fps given ths same barrel length and comperable pressure. And unless you plan to use a slow powder that would not max out performance unless you could fit an additional grain or two into the case, it won't make any difference at all. So a twist rate of a standard 280, somewhere in the rage of 9 to 10, will be just fine.