just stick with S&B 124gn. Its about the cheapest cheap ammo you can buy in our cold froggycountry and tbh its pretty decent stuff these days.
if you want to learn how to shoot, just keep practising, same as with writing, first slow and precise, then speed up.
I think you mean to compete in the discipline, Militair Pistool? You dont have to worry to much about the time tbh, even the last stage of 6 shots in 9 seconds over 3 targets is plenty of time.
Let the recoil do its thing, dont fight it. If your stance is good, your sights will pretty much drop back on target, while you drop back on target get rid of the slack in the trigger, compensate where needed and execute a controlled squeeze on the trigger
and imagine you have no thumb and pinky, that way you can always find your good one handed grip
