HOW ABOUT 25 CAL. OUT OF A 600 MM BARREL USING 38 GRAIN SLUGS. I HAVE3 30 CAL LINERS THAT ALL SHOOT 2 INCH GROUP AT 100 YARDS. DO YOU REALLY THINK YOU CAN BS ME. I HVE OVER & BARREL NOT IN FX GUNS. INSTALLED IN CUstom GUNS. BELIEVE ME THERE IS NOTHING YOU CAN TELL ME ABOUT THESE LINERS. NEXT I WILL BE SHOOTING A HALF IN GROUP AT 100 YARDS WITH THE 25 . AND AFTER THAT THE 22.