Dave, with your experience shooting whitetail with the tropy bonded bullets, say with a 22-250, how far do you think is an ethical broadside shot on a 180-200 pounder? And could you tell any difference in performance between the 55 and 63g Tropy Bonded? Samuel Hall
On a 200+/- pound animal, consistent ethical kills can be made at distances where the bullet is impacting at 1800 FPS or faster (Perhaps I should have referenced impact velocities instead of distances in my original reply). With starting velocities in excess of 3600 fps, that's a long way out there! You can certainly justify slower impact speeds, but then heavy for caliber high sectional density bullets tend to be more effective.
American Handguner Magazine (if I remember the source correctly) ran a penetration test years ago and found that driving a bullet beyond a certain velocity would actually reduce its penetration depth. Very similar to an airplane that you if want to double its cruise speed you must quadruple its horsepower. That because drag increases (trying to remember flight school physics here) at the square of the velocity increase. The best example is the same 300gr .44 cal bullet will penetrate the same distance at 1000fps as at 1400fps. The biggest difference is the larger temporary wound cavity.
The 55gr TBBC seemed to make much quicker stops than the slightly heavier bullets on both Proghorn and deer in my experience.
Ruark reportedly wrote that he thought the 220 Swift was potentially the best thin skinned animal round, but in his day only cup and core bullets were available for it and he saw bullet failure too often to consider it reliable. One can only imagine what he would think of our available selection of premium bullets today and smaller calibers. I know an African PH who uses the 223Rem exclusively for a client gun on plains game up 600 pounds, but 95% of the shots are within 150 yards.
For a few years the police department where I served as a reserve officer, I got to shoot a lot of problem whitetail deer. I used a 6.8spc with factory V-max bullets. They started out at 2600 FPS, remember this bullet was designed for initial velocities in excess of 3300 FPS from a 270Win. It acted like a good old Remington Corelock and not a prairie dog bullet, making a mess of things in the body cavity and leaving a nice half dollar sized exit hole. No deer made it more than ten feet from where it was shot.
I love both the 308Win and the various 6.5mm cartridges for big game and outside of the 416RM for dangerous game and a few years where I was in love with the 338WM really don't see the need for the magnums.
But then as Hannibal said on the TV show the A-team; "over kill is under rated", so what do I know?