I've seen this video in the past but thought I'd post it for those who may not have seen it.
It came to some very interesting conclusions,some I already knew,and some I wasn't aware of.
In my own "travels" over the years I have discovered two realities concerning the oft mentioned caliber stopping power controversy. Extremely small grain aerodynamic bullets travelling at high supersonic velocities tend to rip body cavities and ricochet off bones, often amputating impacted extremities such as fingers, arms and even legs. Such projectiles, depending upon the material of their construction, can either deflect off solid targets or penetrate them, and even pop right through thin armor. But the laws of diminishing returns still apply here. Small, fast bullets reach a speed and lack of density where their inability to transfer much kinetic energy becomes their greatest enemy, in regard specifically to their lack of weight.
The second stopping power reality relates to massive "blunt" shaped bullets traveling at lower velocities. Such projectiles, again depending upon the material of their construction and bullet design, can outright knock down the heaviest and largest men and beasts, and the resulting "shock" transferred into the flesh of living creatures can pulverize, even liquidize flesh and bone. Penetration, on the other hand, can be minimal against "solid" targets and armor, while excessive against softer ones.
I am a lifelong believer in the .45-70, a caliber which dates back to 1873. It is a straight-walled, heavy bullet pushed at low rifle caliber velocities, unless one uses faster, smaller modern incarnations. Almost inexplicably the .45-70 in particular is capable of both extreme range killing power against large, dangerous game as well as up close legendary stopping power. After years of handloading and wildcatting this caliber, I have come to a few solid conclusions about its mythical capabilities. The first: bullet weight, bullet material and bulled design contribute much more to its end result than flashy ballistics comparison charts. Heavy bullet. Effective, specific design. Low velocity. These three factors create a "stopping power" juggernaut capable of matching up to such hallowed and much faster calibers as the .458 Win Mag and .460 Weatherby, in big, dangerous game knock down performance.
Following that line of thought, I recently transitioned away from the venerable and ancient .45-70 to the .50 Beowulf, both for hunting trips to Alaska and up close and personal home defense. While I still admire the .45-70, the 12.7x42mm (.50 Beowulf) retains nearly identical hunting capabilities to the former
and is more adaptable to modern rifle platforms with tactical applications. In the .50 Beowulf I can handload up to 700 grain subsonic loads that while moving very slowly hit with the force of a Mack Truck up close and can be suppressed for special purposes.
Those who have stayed the course with .45-70 for large, dangerous game defense and primary hunting tools all seem to have transitioned to carbine length lever guns with polymer furniture and rust proof metal coatings. While such weapons are quite attractive and reliable (Henry, here's looking at you; also: Marlin) I had for years been in search of .45-70 performance in a high capacity, tactical (if I required it) package
and new cartridge capable of going mid-high range supersonic, if I so chose, with smaller bullets and flatter trajectories out to 600 yards. In the .50 Beowulf, I've found just that. I can run a 20" barrel upper receiver for better overall ballistics and extreme ranges, or I can run a 10" barrel for home defense and other tactical applications. And I can switch between the two in seconds.
Finally, and more recently, I wanted to find a handgun platform similar in capability to both the .45-70 and .50 Beowulf, in particular with similar up close stopping power, and I have, in the form of revisiting the controversial 10mm. The 10mm is a great mix of good velocity (even better out of long barreled incarnations) and sectional density and mass.
On the other side of the spectrum, I've also taken to experimenting again with 5.7x28mm, both in pistol and AR carbine forms. But, at the end of day—both in tactical self-defense situations and when in pursuit of game animals quite prepared to rip one's face (and limbs) off, the combination of .50 Beowulf and 10mm pistol cannot be beaten. Another good companion to the Beowulf is .44 Special, but that's a bit more complicated.