ORIGINAL: ipscshooter
ORIGINAL: frontier gander
Its called usinga big bullet, hitting the right spot and creating shock that runs through its body when the bullet impacts. Has nothing to do with the animals heart beat.
It has nothing to do with "using a big bullet" either. Otherwise I'd be tracking deer I've shot with my .243 a lot farther than deer I've shot with my .30-06, and that hasn't been the case.
I know you are much more knowledgable than myelf, but I am not too sure on this. Logic would say a bigger bullet (.30 caliber) would be more effective. Perhaps you shoot your 243 more accurate and place it better with this rifle?
I am of the opinion that bigger is better, or they would have quit making the rifle at 243. I have heard from many people (internet and local) that someone they know uses a 243 and had a hell of a time tracking. However, you are probably one that can place your bullet anywhere you want it to go and lights out. Then there is Joe "site in" that hunts and gut shots with a 243.
Hence, the magic of the "bigger bullet", an off shot is still pretty good, and will more likely be lethal than that of the smaller 243. I've even read about many hunters using .338 and larger on whitetail!
I used to live in SC (South Cackalackie) and knew a guy that hunted with a 300 RUM. I never got interested in hunting there as the does I seen along the road were about the size of a large German Shepherd!