Hi

I'm a bit lost with my 45. impossible to make a group of less than 5/6 cm with gun support! At 6,8 and 10 meters .I tried at low power the same. Have tight barrel any problems. I have tried all types of lead Jsb exact, express, rs, lead match h&n, meisterkugel, r10. so is it the barrel or myself who have a problem ?

Thanks