Found this on the Brown Encore website. Explains rate of twist for heavy and light bullets for all cal.'s: Interesting about the 22 CF rate of twist and which stablize heavier bullets the best. Sometimes people just buy a 223 and do not check out the rate of twist...Based on info the less rate of twist cause bullets to spin faster each inch of barrel. So you would be better off with a 223 with less rate of twist since you can shoot all bullets most probable accurate..
important if you want to use your 22 CF as a deer gun....
Choosing Your Custom EABCO Twist Rate
You can special order your choice of rifling twist rate when you order a made-to-order Encore Accuracy Barrel, or made-to-order Model 97DRifle.
We have standards we recommend for various chamberings so you don't have to figure this out yourself. But if you'd like to know some guidelines and reasons, here they are: 17 Caliber: Use 1:9 for the rimfires and 1:10 for the centerfires. 22 CF (Centerfire): 1:7 is only for the heaviest bullets. 1:12 shoots 40-50gr bullets accurate in 223 and up to 55gr, accurate in 22-250. 1:14 is only for the lightest bullets. 6mm/.243: Use 1:8 for 90-100gr bullets. 1:10 for 75-85gr. Use 1:12 for lightest bullets (ie. 58gr in 6PPC). On 30 calibers, a 1:10 twist is the best all-around. We DO build a few 30's in 1:8 twists for folks who shoot the heaviest bullets. 308 shooters prefer 1:12 for 155 gr bullets. The rule of thumb with twist rates is this: It is better to err on the side of too fast of a twist rather than too slow.
Choice of twist rate is only available when you order a custom barrel or gun made by E. Arthur Brown Company. Thompson Center barrels have standard twists...
