i guess it's a pretty bad answer but the best solution would be practice

dm and mge until you hit them.

dm / mge and force yourself to use shotty

Take your time.
Force yourself to always wait a second or two before shooting, helps me a lot

Get a friend to jump around in MGE while you go shotgun only. I've seen soldiers get better with the shotgun by using rocket jumper and shotgun only but I don't really find that helpful.

in all seriousness, reload a rocket

back up when you try to aim at them. And I'm not joking. They are purposely jumping up close to you to close the gap

play tr_newbots

Relax.

http://www.youtube.com/watch?v=sH6r_rddM58

use gunboats so you dont have to worry

What Ill do is equip the rocket jumper and go into dm servers focusing scouts and shotty them

wait for them to move in a predictable fashion (usually after a double jump) then shoot them

The problem with waiting against scouts is that they're not going to wait to click on you. So while you're waiting for them to finish their jump, they will have already done 150+ damage to you.

if a scout is moving all over the place and jumping over you, you need to twitch your shotgun shots. You could probably learn to track scouts with shotgun slowly over time, but it's just less useful than twitching and 90% of players can't do it consistently.

I wasn't joking, when you fight jumpy scouts it's best to back up while you shoot because it closes in the distance they can move in front of you with each jump. This forces them to have to jump towards you if they want to close the gap making them even easier to read. Try it, you'll like it.

alright so what youre gonna do is just yell at them while youre dming and just think you have the biggest dick in the game and it's no big deal

your accuracy will improve 1000%

example: mike

Hit them with a rocket first, makes their movement more predictable and you have to do much less damage.

I don't main soldier, but this is what I would do.

- If you can't hit the scout with a rocket first, and you don't think he's been hurt start screaming "HELP HELP HELP" into the mic. This way your team will know that you are about to get styled on by a scout with height advantage etc.

- Most scouts will be a lot less careful with you once you've pulled your shotty, so just keep 1 rocket loaded, bait them into charging at you, and shoot the ground directly in front of yourself if you miss several shotties.

- If it feels like you're clicking on them or you see tracers hitting them, but aren't getting any reg, try fiddling with your cl_interp and things of that nature.

I'm assuming you play pocket because you have a shotgun and not gunboats. I played pocket for the longest time and if you are trying to hit a scout with a shotgun in close who is juking and spamming jump he's going to be hard to hit. as someone else said, just reload a rocket. If your med is healing you most of the time that scout isn't going to be able to kill you in the time it takes you to reload a rocket and shoot the ground. By trying to shotgun him you are giving him more time to kill the med or you. Reload rocket, shoot feet, get kill.

If you are out of rockets (shame on you first of all, you need rockets to protect the med. keep track of ammo and never run out) and are forced to use a shotgun wait until the scout uses his double jump before you fire, he can't change his direction again until he lands and jumps again. When a scout double jumps in close against a good soldier he is going to get wrecked most of the time. If you just spam shotgun at him and you are missing, you might fire, he double jumps before you can shoot again and you miss your chance for the easy shot. Be patient and make the shots count. Practice on mge or dm servers if you want. You could even pub and go shotgun only.

Play Scout.

What TLR said. Knockback in general in this game is pretty stupid, take advantage of it.