Quoted: Okay, so you guys are saying the 7.62x39 sux? But that the 5.45 kicks ass? But, like some of the arguments i've seen, isn't 5.45 HARD to come across? Are its ballistics kinda close to m193 performance.
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I have heard that the 5.45 round relies on a specific bullet design to be lethal, and you aren't going to find this exact bullet manufacture process in ammo available to civilians in the US, just like only some 5.56 ammo will fragment, but cheap target 5.56 ammo will fragment far less, and just be good for plinking.
There can be a huge debate about ammo lethality here, on the con side, people can site the Hollywood bank robbery a few years ago, where the robbers shot tons of 7.62x39 and critically wounded many, but no one died, and on the plus side, I have read that some Russian Special Ops guys favor 7.62x39 as it has far better obstacle/vehicle penetration than their newer 5.45 round. Also have read about plenty of people taking deer with 7.62x39 without problems, but good shot placement is the key with any mid-power round.
I have an SAR-1, it was a dirt cheap AK, and I chose 7.62x39 as it was the "classic" AK round, made for AK's by the multi-million around the world.
I mainly shoot to enjoy the historical significance of the gun, so 7.62x39 is the only real choice for an AK in my case.
I was just at the range today with both my AR and my SAR-1, and always notice that the 7.62x39 AK round reflects a bigger mess out of the dirt mound behind the backstop, making a distinct smacking sound and throwing up a ton of dirt with each shot, whereas each 5.56 round gets absorbed into the dirt with relatively little reaction. This action always made me have a bit more faith in 7.62x39 as a decent round, though not a scientific fact.
One last quick tidbit, stick to either 7.62x39 or 5.45 for an AK, have read and heard much that many 5.56 AK's (like the SAR 5.56 model) are much more sensitive to bad mags, due to the smaller rim. Though 5.45 is smaller than 5.56, they designed the rim to be much greater in diameter, and thicker, which reduces the chance of an ejector tearing through the rim compared to a 5.56.