comparison in all the usual areas-bolt work,extraction,ejection,of course #1 accuracy. looked at prices and carbon runs about $100 more. anyone have longish time experience with either or both? never had any experience with any of the carbon barrels and know nobody with a long time behind one. other 2 options are cz457 varmint and,only maybe,the RPR. at my age and time shooting,new tech things leave me hesitant. some of the newer stuff has been good for me and some not. thanks for feedback.