i've gone over this a few times before, but just to clarify....
when i started hunting i used a 20 gauge shotgun as it was a shotgun only zone. every deer that we took back then ran a ways after you hit it, you could count on it. the only one i saw that didnt run was a yearling that i shot through the head, and while it didnt run, it sure didnt give up the ghost immediately. i know that deer was dead instantly, but the animals body took a while to realize it. a few minutes later a shot to the neck instantly hit the "off button". there were several deer that were still alive when we reached them and needed to be finished, and a neck shot again turned them off instantly.
then i moved north and started using a 35 remington. a killer for sure, but results were the comparable to the shotguns i had used in the past. i took a few deer with that gun.
back in '97 i boought a 270, and with one exception, all have dropped instantly with no kicking or thrashing. none have been hit through the heart. two were forward of the heart angling back and exiting behind the off side shoulder blade. one went through just forward of the heart smashing both shoulders. and the rest as i recall were a tad behind or above the heart, everything else in the chest cavity was jelly. and they were all b/f's; except that one i hit through the diaphram which did travel a little. since 97, i would estimate the deer i have shot with that rifle is between 20-25 deer. only one traveled past the place it was shot at.
the only other shot with that rifle that didnt result in a b/f was on a gorgeous red fox. it came through and the day was moving along slowly. i shot him across a lake (a great shot) and he took off and ran about 30 yards before expiring. i expected a quarter sized hole in him, and spent the rest of the day thinking about where in my house i would put his mount. well, when i got to him at the end of the day, there was a hole about the sive of a baseball through him, where his heart and lungs used to be. how that animal ever moved at all i will never know. if anything should have been dead instantly, it should have been that fox.
and as i have stated before, my brother uses a 270 and we have hunted side by side for alot of years now (the more i think of it the more i realize that the age monster is sneaking on me). he uses a different load, as he had a bunch of bullets he got for cheap (sierras, i believe) and his deer typically ran a little after being hit. this last year he shot up the last of them, and i sent him home with a 100 pack of nosler 150 bt. that should be good for another 70 deer for him, which will carry us a way down the road of life.
my other friend that uses a 270 uses either remington core lokt factory ammo (150's) or winchester 150 graing round nose factory. all his deer have been b/f's except for one big doe he took a few years ago. the only two similarities with him and i are we are using 270's, and we are both military trained; so perhaps our shot placement is similar. and that is just a guess.
what does it all mean? i dont know. i dont discount what others here are sharing. all i can tell you is that the ones i have shot with my 270 have giving me b/f's reliably. from what i have seen, it is what i have come to expect with a good shot. there have been just too many consecutive kills with that result for me to discount it. am i just getting lucky? could be. truth is i dont know why i get those results, i do believe that the bullets i choose to use has a good deal to do with the results i have seen.
one thing is for sure though, i DONT like being called a liar just because someone may have seen different things than i have seen. that said, i am taking the chip off of my shoulder as i am getting tired of carrying it around. it will stay off as long as i dont get torched again.
best wishes to ALL.