How do I effectively use the Beggar's Bazooka?

In TF2, I was wondering how, as a soldier with a Beggar's Bazooka, you would you kill a scout effectively. Since it takes such a long time to load all three rockets, the scout usually has already killed you by the time you'd be ready to fire. Any tips on how approach this?

If you have to fight and your rocket launcher (of any flavor) is unloaded, you should be swapping to your shotgun. While its weaker, its more than capable of fending off a scout since they have less life than you and must engage at closer range

Most of the time, you should let your teammates kill the scout while you reload. The Beggars' Bazooka is not a weapon you should be roaming solo with - its 1v1 and jumping abilities are somewhat unreliable due to the whole loading mechanic and reduced accuracy, and the recent change has reduced its jumping abilities (overload jumping comes with a penalty). In other words, if you ever find yourself alone with an unloaded Beggars' Bazooka against a scout, something went wrong.

If you do find yourself in that situation, as has been stated shotgun is probably your best bet. Another alternative is trying to use single rocket jumps to run away.

If you are really trying to roam with the Bazooka however, you probably have Gunboats on, in which case jumping away is probably your only option.