I just got one of these, and since i have never used one before, would it be a good idea for me to tighten the set screw before i push the whole thing into the chamber so i can make sure that it is all the way in before i try to push the bullet out towards the lands? and as far as knowing when you hit the lands, i just pushed really slow until i felt resistance which i am assuming was the lands, would that be the best way to tell if i hit the lands or not. Any help with using this would be greatly appreciated. Thanks