By the way in the armory where I bought the rifle I was told that the length of the barrel was 63 cms and today I have measured it with a ramrod introduced by the mouth of fire until I hit the bolt and after making a mark I measured the length of the end of the stick to the mark and it has given me 61.5 cms. Is the loss of speed of 8x68S a lot with that length of cannon? Should I worry about the loss of benefits? Thank you