I' m going to agree that it' s the bullets, I do extensive testing on all bullets, factory or otherwise, before I load them during a hunt, and the core-lokts are crap, good for coyote, but to volitile for deer. I was going to blame it on poor shot placement, but you claimed that they were good shots, if they were, then it has to be the bullet performance. If you' ve noticed this on a regular basis with these guys, it can' t just be the deer, yes, if it was only one guy' s deer and it ran a long ways, I would attribute it to the deer, but since EVERY one you' ve seen shot with a .270 runs a long ways, then it can' t be the individual animal EVERY TIME. Have those guys try on a new pair of shoes, core-locts are crap, at ranges over 150yrds, if you can get them on the page, the bullets are slowed down enough that they don' t shatter, but at close ranges, in a 270win they' re still over 2750fps, they just blow up.