I probably try some 60 gr bullets before long but I WILL DEFINITELY GET A 22 6mm Improved Reamer ordered !! The Blitzking bullets are good bullets for speed as well as Noslers in my Swift . What would be the next twist for 55-60 gr bullets ? How long of barrel ? 3 groove or 4 groove ? I heard a quote sometime back guys were scolding another shooter for his 24 -06 Improved as being grossly over bore and inefficient and the reply was so : So is a F 16 but sometimes performance matters ! Thank all of you guys for the replies .