there has been a lot written on 22 cal barrel twists since the advent of the Militarys AR-15. when the first .224 cal cartridges came to be they were found that a 1-14 twist was the best according to barrel makers Blilss Titus and the Pfeifer rifle co.And i can say that a 1-12 twist will stablize a 60 gr. bullet. I shoot 70gr.speers and barnes in mine all the time,and they shoot just as accurate as do the 50gr. speer tnts and 55 gr bullets. I have found that most of the time these instructors in law enforcement,and as the military i think read too much of there own press or some thoughts of some whom don,t know and pass it on as written in granite! I have been down this road with other people whom have blinders on there brain before. And if they don,t believe me i will dare them to sit out there and be my target. Load them up and give the 60grainers a try.I,m not saying for sure they will for all barrels are different but they should. vangunsmith