rifling twist

Twist for a .22 Centrefire


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Q: I know that .22 centrefire rifles, and the .223 in particular, have different rates of rifling twist. These seem to run from 1:14 on the slow side to 1:7 on the fast side. Just what weight of bullets are the different twist rates best suited for?
Arthur English

A: The 1:14 twist is adequate for use with the various thin- jacketed, super explosive projectiles if the muzzle velocity is held below 3300fps. The standard 1:12 twist of the .223 works well with all high velocity .224″ bullets from 40 to 60 grains. Certain .22-250 rifles use a twist rate of 1:10 which usually functions best with bullets of 55 to 70 grains. Some target rifles with a 1:9 twist seem to do their best with bullets from 62 to 70 grains and particularly Sierra’s 69gn Match King bullet. Rifles with a 1:7 twist used for big-bore competition definitely prefer the heavier bullets of 62gn or more with some rifles shooting satisfactorily with weights of 80 and 90 grains. However, avoid using super-explosive bullets in the faster twists as the stress of a high rotational spin can cause such bullets to fragment in flight.


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38
46 shares, 38 points

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Nick Harvey

Nick Harvey is one of the world's most experienced and knowledgeable gun writers, a true legend of the business. He has been writing about firearms and hunting for more than 65 years, has published many books and uncounted articles, and has travelled the world to hunt and shoot. His reloading manuals are highly sought after, and his knowledge of the subject is unmatched. He has been Sporting Shooter's Gun Editor for longer than anyone can remember. Nick lives in rural NSW, Australia.

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