yesterday I've given a handful of cartridges (200 grainers SWCBB over 4.6grs og N310 for a PF of 176)to a bud to give this load a try and today he's called me on the phone asking if they were cartridges for minor,since they barely reached a PF of 150 .I told him that A)I shoot major and that B ) they came from a box of cartridges that had been chronoed during a match,hitting a 176 PF and that his chrono's battery may have given up the ghost.At his point he did reply that in fact even his very own cartridges which up to last training session gave a PF of 174 barely reached 130 with a tremendous spread between cartridges !
Now,since he's assured me that his chrono's ok and so is its battery which could be the cause of such a tremendous loss in velocity and resulting PF drop (or the other way round)?
I told him to check the barrel for any hairline cracks around the chamber area or even along the whole barrel because if the pistol performed flawlessly up until Tuesday I cannot think of any other reason.He hasn't checjked the gun for accuracy,just chronoed them rounds,packed up his thing and started scratching his head.
I'd really love to hear from you and tell my friend about your thoughts!
Edited by Canuck63, 15 March 2012 - 08:09 AM.