Marine Scout Sniper, on Aug 5 2008, 12:18 AM, said:
To answer some things I know..
I have fired a .44 mag and a .45 ACP pistol. In battle I would prefer a .45 ACP I've also fired a .380 AUTO While accurate and has SOME pop it's still a pea-shooter to me.
A 7.62x39 mm Soviet round (like an AK round, same thing) kicks less than a 30-30 round. I fired an SKS recently and while some may dog it as being Russian I can tell you an SKS is very accurate as far as rifles of any type for any purpose aside from sniper rifles go.
.380 Auto and a .40 is as close as I would wanna get to a 9mm. The .40 was fun even bump firing it but a .45 ACP is one of the rounds for me. The recoil is smoother than you might think. A 175 grain high velocity .44Mag will light up the world and recoil like you won't believe. With a .44 mag the more grains in the bullet the more manageable the recoil seems to be even with high velocity rounds.
Smaller rounds vs. bigger rounds, physics and practical answers.
what you want is inertia. Penetration is mostly based on inertia. A smaller round has the potential to accelerate faster without more use of energy like a larger round.
Since the smaller round has less mass it doesn't store energy for greater distances this is why stopping power becomes limited after certain ranges are exceeded.
Since larger rounds have more mass it retains more energy. This increases inertia and effective distances as well as stopping power.
Because the larger rounds have more mass they require more energy in the form of powder. This also causes the casings to be larger.
Pistols do not have cartridges that are as long as rifle cartridges, this limits range.
Shotguns are still helpful in CQB engagements because of armor piercing rounds in 12 gauge. I can name one. A Lead Encased Steel Slug. These WILL stop you even from behind a wall. Ouch..
Two ways to increase velocity. Decrease grains in each round. Or add more powder. If you add more powder you may be looking at the need for a bottlenecked, or similar designed cartridge, or a longer cartridge. You will then have to redesign your weapons to hold the new cartridge.
If you decrease the grain count for each bullet, you also decrease it's inertia from stored energy and when you do that you may decrease it's stopping power.
This is why It's harder to stop a Semi than a Mazda, inertia. Hope this helps.
Inertia is the wrong word to use for your argument
I can kick a soccerball farther than a bowlingball because the soccerball has less inertia than the bowlingball.
Inertia-Inertia is the resistance an object has to a change in its state of motion.
Momentum is a better word for your argument.
EDIT: Hmmm I guess you could actually argue Inertia would be the correct term because your talking about if something has more mass it is harder to slow down, apologies.
This post has been edited by Volker: 04 August 2008 - 10:41 PM