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Results with the 60gr ammo seem to vary considerably. In some rifles it will tumble and in others it won't. As noted most .22RF rifles have a 1-16 twist and you will frequently find its not enough for the 60gr bullets. Volquartsen makes a 1-9 twist barrel for the 10/22 which works great. I've built a few pistol barrels with a 1-8 twist for suppressed High Standard HD's that also work fine. What you are going to find is that if you want to shoot the 60gr ammo with suppressors you will really need to have at least a 1-12 twist as our Kiwi friend noted but in the US more commonly found will be 1-9 or 1-8. As he also noted its not very accurate even in the faster twist rate barrels so don't expect benchrest accuracy. On the other hand the 60gr bullets are pretty hard on raccoons and other verminous troublemakers so an inch at 50yds isn't out of line for that purpose.
Frank
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