Ha ha, I called in an A10 airstrike once in combined arms training. I was batt. ratelo at the time. THAT was cool, two came in and circled the tank, one dived and fired, then the second did and they took off. The tank looked like the Fourth of July for a couple of seconds. The recoil looked obvious when they fired, it LOOKS like they go backwards (but they don't)! We watched from a mountaintop and had a real good view too.
I got to call in the night mission, and later two Navy Intruders from a carrier in the Pacific, but I missed whatever they did. We had to have IR beacons and orange flags on our vehicles so we wouldn't get accidentally lit up. That would have been nasty.
I called in some arty, but I was so far away I never even heard it. I did see 155's go over head, they look like barrels going through the air, at Ft. Lewis. Lots of recoil on those babies and range too, they fire on one side and the splash is on another.
As for shoulder fired, I don't know, I used to. It's messed up now and I'm not so keen to aggravate it. I prefer an M4 for HD to a shotgun for this reason (and I'm better with the M4). I have a .50 Beowulf that is just the bees knees to shoot though, nothing like a 12ga. kick in an M4 platform.
Not fond of the recoil in an FAL, I kept getting ACOG rings on the forehead and busted one lens cover, so I switched to an Elcan. At least it has a rubber coating.