I have had two Savage 99s in .22 High Power.  Bullet weight was 70 grains.  Both were take-downs.  Would do no better than a 4" group at 100 yards, even with a tang sight.

No longer have either one.  I never measured the twist, but a visit to Phil Sharpe's The Rifle in America tells me twist was 1:12.  The cartridge is simply a necked-down .25/35 WCF.