love my HMR and 22lr, use them both for different jobs, shot many a group of rabbits with both calibers, never seen a split case only ever used Hornady V max, on my second outing i took a shot with the HMR and it sounded like nothing happened apart from the click of the trigger, i waited a minute then ejected the case to find it all still full of powder and knew something was wrong, took the bolt out and couldn't see daylight so did an internet search and found out i had a squib, had nothing to get it out with so hour back home to get my cleaning rod to poke it out, it now lives in my truck just incase, always inspect my bullets for splits, iv probably shot a good 3000 and not one split,