No, they fly straight.
Yes
If by flip you mean tumble in the air then it depends on the type of AK that is being fired. If the AK is cheaply made and has a low quality barrel then the bullet may tumble in the air. Quality AK47s do not have this problem.
7.62x39
No
Being shot with an AK assault rifle causes extreme pain.
Both the SKS-44 and the AK-47 fire the 7.62x39 cartridge.
11
7.62x39 cartridges
No it's not designed to do it.
{| ! style="padding-right: 1em" | | 7.62x39mm |}
Around 11 rounds
neither gun is bigger just the bullets are bigger...The AK-47 has7.62x39mm round.The AK-74has the 5.45x39mm round.