I was at a high elevation(wind factors to consider)....in open land (powerline)(wind factor)....and 400 yards away(distance factor) with winds blowing at the south and west(directly at me and to the side sparadically) at 10 mph.
Which means...my bullet I was shooting (130 grain)...there is no way a heart shot , or any other would have dropped it. Fatally wounded it, yes , most definately...but not dropped it.
(I could have, of course..aimed for the head...but, with all those factors in...I decided definately not to even try, simply because I limit head shots to a certain lower yardage to decrease the risk of wounded deer)
But, you're right...there are some calibers with certain bullet grains that can drop a deer with a good heart lung shot. My .270 mag with 130 grain does not do it. (It does, however put a hole big enuff I can put my hand in if shot within close range. The exit hole on this one..I couldn't put my finger in, but it is because of the distance.) I haved upped to a 150 grain bullet and dropped them, but I found that I damage more meat that way.
But, my .300 mag, for instance..with a low grain bullet..I can drop them instantly with a clean shot. (Again....at reasonable yardage (150-200 yds)...I end up wasting meat.)
Normally, I shoot heart-lung and they run off(never more than 100 yds). But, I prefer it simply because "tracking" is a vital part of honing up hunting skills.