It depends on the vest. Some vests will only stop handgun rounds. Some vests will stop rifle rounds. Vests are "level" rated. The higher the level (1, 2, etc) the higher velocity/caliber the vest will stop.
No it cant go through it.
Very small trees.
This can be tricky because not all vest are the same,vest that cops use can usually be pierced by medium caliber rifles like a 30-30 or AK-47 or high caliber hand guns like .44 mag, but the dragon armor as they call it they some times use in the army can withstand a 50 caliber rifle,the most powerful rifle every made beside armor piercing rounds,but funny enough a 22 mag can pierce a normal vest,even though its not very powerful if its a full copper jacket it can pierce,thats because its such a small bullet that it does not take as much power to pierce objects as a large 45 caliber or 50 caliber would.
7.62x39mm
7.62x39
The AK-47 shoots a 7.62 x 39mm bullet. The 39mm indicated the length of the brass/steel case.
.311 bullet diameter, 7.62x39
7.62×39mm
The AK-47 uses the 7.62x39mm round. Note that the AK-74, a similar firearm uses the different 5.45x29mm round.
In mobster you don't actually kill other mobsters, you ice them. You ice them by over coming there health with attacking them. Example Your mob fought with: 1 Bulletproof Escalade, 3 AK-47, 3 Bentley GTC, 1 El Camino, 15 Uzi, 3 Beretta 9mm, 6 Bullet Proof Vest, 10 Pump-Action Shotgun, 6 .38 Special, 1 Baseball Bat, 1 CrowbarEric Big Daddy P 's mob fought with: 1 BMW, 1 Bullet Proof Vest, 1 Pump-Action Shotgun, 1 El Camino, 1 AK-47, 1 Uzi, 3 .38 Special, 4 Beretta 9mm, 2 Baseball BatYou won the fight, taking 5 damage and dealing 30 damage to your enemy. You gained $428 and 1 experience points. You Iced Eric Big Daddy P In this case he had less than 30 health left
7.62mm bullet More specifically a 7.62x39mm bullet (the military version of the .308 winchester).
In the 2000-2200 fps range.