Solid pilots that are too small may help to cause chatter. Solid pilots that are too big will not fit the barrel and stop the job dead (this has happened to me). You may notice that JGS does not do solid pilots any more and have any left overs on sale. Manson only makes solid pilots and if you want a bushing they rework the reamer, grinding for the bushing and adding a groove for the C clip, this adds to the cost as it does to have them grind the bushing area for muzzle flush oil passage (they may do this for a non Manson reamer). Solid pilots are not worth the effort in my opinion. That's all I know. YMMV.