first, I know absolutely nothing about mortars, but... is there any way to know where your projectile goes? do you go look for it or measure it's muzzle velocity and/or trajectory?
Aha! By the question we have potential new cannon shooter, I can tell.
If you do your research before firing you pretty much know where the ball is going to go. The only "forsure" is the direction. It's kind of like shooting any firearm, the first few shots are for sighting in. Just like in shooting rifle you go check the targets to see where you hit and adjust you loads and sights accordingly.
It seems like a really cool hobby but i was wondering if results are important or if it's more of a manufacturing rather than firing hobby.
The answer to this question is YES! Yes it is a real cool hobby. Yes results can be important. Yes it can be a manufacturing hobby. Yess it can be all of these.
Go to the top of our forum and you will find a list of Cannon shooting supplies and suppliers on the internet. Take a look around at the first group called Cannons and carriages. You will find a ready made cannon to fit your budget with those suppliers. A good first mortar might be one of the golf ball mortars.