In real life, try lugging the barrettm82 and run right at people and make a kill point blank range. Not to mention a high velocity round from far away builds up explosive power, capable of literally blowing up a persons torso or a limb, whereas close range it would just go clean through not even causing explosive force which is the real killer behind bullet wounds (why a pistol round can be more detrimental than other bullets after it causes shock and bile to force into the area of impact not to mention the bullet being lodged in the wound causing the body to attack itself)
Sir, what the fuck are you talking about? Where does this "explosive power" come from? What exactly happens to the bullet in terms of physics? What kind of powers are affecting it as it flies through air? What causes that so-called "explosive power"?
To answer you: there is no "explosive power". There's absolutely nothing which would cause such "power". Pretty much the only "power" a bullet has is it's kinetic energy which can be calculated as E=0.5*mv^2.
What you talk about pistol is nonsense in this context. The only thing which holds true is the effects known as hydrostatic shock(especially ballistic pressure waves) and energy transfer which as such mean the stopping power of a bullet. These are rather complex subjects(not even mentioning bullet yaw) which would involve lots of explanating and studying to understand deeply enough, so I'll simplify things and introduce a following drag equation: Fd=0.5*pv^2CA, where p is the mass density of the fluid/tissue, v^2 the velocity of the bullet, C being drag coefficient and A being the area. Oh, this is also the actual equation used to calculate the loss due to air resistance. Fill in the proper values and you can calculate it yourself, and see how the kinetic energy of a bullet decreases as it travels through air. Faster bullets have higher drag.
What changes between different bullets:
v^2, the bullet velocity (e.g. ~720 m/s for standard 7.62x39 bullet used by AK-47)
C, the drag coefficient, (the shape of the bullet, how efficient it's aerodynamics are. e.g. rifle bullets have lower value than usual handgun bullets(e.g. parabellum), and some hollow-point bullets have higher than standard FMJ bullets)
A, the bullet area. E.g. 7.62 mm bullet has area of 3.14159*7.62² =182.41 mm², while 5.56 mm bullet has area of 3.14159 * 5.56² = 97.11 mm². Standard 9 mm handgun bullet has area of 254.46 mm².
Also perhaps worth mentioning(not related to the drag equation, but to the kinetic energy of a bullet) is the mass of a bullet itself, which obviously changes between the types of bullets.
Oeh, greets to dicko and Tanaka who can suck my cock.
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