Effective Firearm Calibers.

This is a touchy subject in the Tactical and Survivalist community. There is a Large "Battle" if you will, between .223 Remington and 7.62x39mm. More specifically the AR-15 and the AK-47. First off, I'm sick of hearing it, use what works for you! weather it be .223 Remington, 7.62x39, 5.45x39mm, or even a damn .22! But here are some Pros and Cons of some calibers anyway.

.223 Remington/ 5.56x45mm/ 5.56 NATO

PROS
- Proven in Military (5.56x45mm) and police(.223 Remington) usage.
- Lightweight.
- Affordable.
- Readily available in SHTF.
- Usable in U.S. Military weaponry.
- Ability to penetrate body armor at close range.
- Accurate to a point.

CONS
- Shit accuracy past about 400 yards.
- minimal penetration past ~150 yards.
- People(/troops) will kill you for your ammunition if they are desperate.
- Most firearms that shoot .223 Remington are Very expensive. (AR-15's are usually 700$+)

7.62x39mm

PROS
- Proven in Military and Police use.
- Affordable.
- Readily Available after the Shit Hits The Fan.
- Has a hard impact out to 400-500 yards.
- Accurate out to around 500+ yards.
- Most Enemy troops that would invade have AK-47s as a part of their armory.
- Many Firearms that fire 7.62x39 are very inexpensive (SKS's are 275$-400$, AK-47's are usually 375$+)

CONS
- Lack the ability of Light Armor Penetration past ~100 yards.
- Inaccurate for Long Distance Targets.
- Heavier than .223 Remington in large loads.
- You can't carry as many rounds of 7.62x39 in your Tactical Vest or LBE than .223 Remington.

.308 Winchester/ 7.62x51mm

PROS
- Decently Availability after the Shit Hits the Fan.
- Accurate for Long Range Targets.
- Very hard impact.
- Proven in Military and Police use.

CONS
- Heavier than most rounds.
- LOUD.
- More expensive than some rounds.
- More used by a Designated Marksman.

Let Liberty Rain Down upon us All!
Don't Tread On Me.