How many lands & grooves in the barrel? How far are you jumping to the lands & what powder are you burning? You might try a 95 smk and slow it down 100 fps. You could probably get similar ballistics.I have a Xcaliber 22 creedmoor barrel on a tikka t3 it is blowing up 85.5 gr Bergers at 3250fps I only get 5 to 6 shots then it will blow up every one of them I was running them at 3290fps no problem I don't know what has changed cleaned it good looked at it with bore scope little to no fire cracking it is a 1&7 twist any suggestions thanks doug