In Vietnam my boat had .50 cals. But in close to the river banks, or when doing an insertion or extraction of a team, we were off the big guns and using our small arms. In 1968 I had an M-2 carbine and a .45 acp pistol. Granted, we are talking no more then 30 or 40 yards and under some stress, but the carbine in full auto will hit and take down a target. What percentage of hits, I didn't stop to count. Wrapping the sling around your hand up at the band, then pulling your elbow towards your body can hold down the muzzle rise to be controllable factor. My next tour we had M-16's, they were easier to keep on target.
Shooting an M-2 in the 80's without being shot back at was a lot more fun. But this time I was paying for the ammo ($8-$10 a box), that was not fun. Had a Thompson and M3 in the 80's also. The Thompson was the most fun to shoot for me. I liked the wood stock of the Thompson over the wire of the grease gun. Sad to say now restrictions have stopped that in my area. But it was a blast. No pun intended. I envy emmagee1917 having that fun today.