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My gun example is inaccurate with the reference frames that were implied by it. My point there was that the powder charge was the same. In other words, the gun did not need to be loaded differently to achieve the 60 fps. There is no prefered reference frame in physics. All reference frames...

"it certainly takes a heckuva lot more energy to go from 299,792,448 m/s to 299,792,458 m/s than it does to go from 50 to 60 mph" Yes if you're watching it. Not if you're the one who's doing it. That's what the whole thing was about. Someone braking a car (and obviously moving along with it).

(as long as all energy calculations are refrenced to the earth). That's what I was referring to. It depends on your frame of reference. Unfortunately I neglected to specify what reference frames I was using. Now what does a passenger in a decelerating car observe, about the energies...

lbmii seemed to have discovered a correlation between stopping power and momentum, though, not between stopping power and penetration, which would be more in line with energy. Knock down power is funny; anything that could do that would also knock the shooter on his butt. Sectional density...

So does this all show that it really is about energy? Penetration is proportional to mass. Energy is proportional to mass. Penetration is proportional to energy. Penetration is proportional to velocity squared. Energy is proportional to velocity squared. Penetration is proportional...

"This is not true. It takes 11 times more energy to decelerate from 60 mph to 50 mph vs. decelerating from 10 mph to 0 mph." Acceleration and deceleration are equivalent. So: A gun with a heavy bullet and weak charge fires the bullet. Initially at rest, 0 fps, the bullet accelerates to...

One thing you could do is try to find some penetration tests that were done in ballistic gelatin or water. If you have the bullet weights and velocities, you can estimate the relationship between momentum and penetration (and energy and penetration) Something that might be relavent also, is...

That is probably a difficult question because there are so many factors. One in particular is that the material being impacted is going to pile up in front of the projectile and add to the mass that has to move through the medium. Decelerating from 60 mph to 50 mph is no different than...

OK, thanks. How does the front to back dimension compare to a 1911 .45? Also how does a 1911 type frame hold up with 10mm? I won't get a chance to possibly see any till gun show next weekend.

OK, thanks. Looks like it's not as important as it is with guns. A cabinet with some type of fireproofing could be a good idea, even if not burglar proof.

I like it. I went out out several times shopping for for a .22 pistol, and came back with .357 mags and .44 mags before I ever bought the .22. I finally did buy a .22 and it's one of the best caliber guns I ever bought. I now own 2 .22 pistols and a .22 revolver. However, the challange of...

Is it worth buying a safe (even a cheap dept store type) to keep ammo in? Does ammo have a significant risk of being stolen? I would be much more concerned about it's misuse than it's value; but is it something to worry about? After doing some rearranging, I discovered a whole lot more ammo...

Is there a current production 10mm with a small grip frame? Did the old S&W 10mm have a small grip frame? I guess I would be looking for a single stack magazine gun. Range use only, small grip frame, all else not too important. I find the 1911 to be perfect, just as a point of reference.

Pro-shot makes a nice rod with very smooth bearings in the handle. They come in various lengths.

Also, the front sight housing should be resting on something solid - heavy vise, block of steel, etc. The more solid it is, the easier it will start.

I like muzzle blast. I was shooting my S&W model 60 2-1/8" barrel .357 mag. When I empty the cylinder, I put the empty cases back in the plastic tray that the rounds come in. So like usual, I put the empties in there and loaded the cylinder again. I fired the 5 rounds and went to put the...

That's true, insulation would change things. It's shocking how bad advertising hyperbole has become.

Anybody know where they get those voltage figures from (500,000 volts)? The voltage will build up until the air in the gap between the electrodes breaks down. This is about 25,000 volts per inch. So with a 1" gap, the voltage would never exceed 25,000 V. Also the circuit will be severely...

There was an experiment done and published in a gun magazine to determine how much velocity would be lost in a long barrel. I can't remember the results, unfortunately, but I seem to remember that it was quite a bit longer than a rifle barrel. They had to weld together a few lengths of barrel...

From Guns & Ammo ballistic tables: From 6" semiauto 40 grain standard velocity (various manufacturers) 940 fps muzzle, 844 fps @100 yds 78 ft-lbs muzzle, 63 ft-lbs @ 100 yds 38 grain high velocity (Federal) 1089 fps muzzle, 937 fps @100 yds 100 ft-lbs muzzle, 74 ft-lbs @ 100 yds...