I've noticed sort of a theme in my research. The Golden Sabers, Gold Dot, & Critical Duty types all have pretty much the same velocities and energies, but have increased bullet weight over standard pressures of least weight.
Whereas the Buffalo Bore, CorBon and DoubleTap shortly decrease bullet weight and significantly increase velocity and energy.
Just an observation, seems to be two different schools of thought on defensive function.
velocities and energies are only part of the equation when determining stopping power. While they are helpful in comparing rounds that have the same type of bullet, they can deceive someone on how well they stop.
The ability of a round to stop an aggressor is a combination of factors that is encompassed in the science of Terminal Ballistics. This is ballistic data encompassing the time the round enters and spends time in the body. Each type of round reacts differently and therefore affects the target differently.
Tissue disruption is the difference between the temporary stretch cavity and the permanent crush cavity. This can be effected by whether the round passes straight through, or mushrooms, dumping the majority of it's energy in a very short distance, or fragments, causing multiple crush and stretch cavities, albeit smaller.
Placement also comes into play, as trauma applied to vital organs or the spine can be immediately debilitating, even with minor effects. However, a round expending large amounts of energy and damaging massive amounts of tissues my still cause death only by hypovolemic shock (oxygen/blood loss to tissues) in minutes or hours if badly placed. I refer you to this article for a more advanced look at the subject.
So velocity and energy are important, but HOW the bullet utilizes the energy in the body is equally important as is initial placement. There are many, many facets to determining efficiency.
. Malo periculosam, libertatem quam quietam servitutem." (I prefer the tumult of liberty to the quiet of servitude.). Thomas Jefferson
"All that is necessary for the triumph of evil is that good men do nothing."
-Edmund Burke, Loosely translated from Thoughts on the Cause of Present Discontents. (1770)
Very interesting and great points. I think I'll do some more backyard ballistics with some of these rounds before I settle on any one.
I only recently started to question standard pressure because the federal jhp I've been carrying fail to fully mushroom from my gun in jug tests. The CorBon did great! I think I'm going to start with the high velocity stuff and work my way down.
I know milk jugs aren't the most accurate, but they're what I've got and without proper equipment or willing bodies, good enough.
I did find Hornady critical defense to be reliable in 45, perhaps, if I can find some, I'll try them in 9mm as well. Man what a pain all this is.
So here's what my current testing has produced thus far, and why I'm inquiring further about ballistics.
The larger round, fully mushroomed, on the left is Hornady Critical Defense FTX in 45acp, 185gr, from a 3.8" barrel. It performed consistently and reliably.
The smaller round to the right, Federal Premium Personal Defense in 9mm, 124gr, deformed and barely expanded at all, from a 3.4" barrel. It to performed consistently, but as you can see poorly! Not a one of the 20 completely mushroomed. Most did les than this and went straight through into the backstop.
I didn't maintain any of the CorBon I shot previously because it was before I realized I was going to really get into all this, but after seeing the poor results from the Federal, I knew I had to start. Will do the CorBon again along with some others out of sheer curiosity.
It must have to do with barrel length and velocity, perhaps bullet weight as well. In any case, here we go! Lol