Buy in for 50BB. Reload at 40BB. Evaluate table conditions when you near a full-stack. Playing short stacked makes it easy to get it all in on the turn in a lot of situations, so all your decisions will be made pre-flop and on the flop. I half-stack about 50% of my NL sessions. I don't really know what I'm trying to accomplish by doing this, but according to my notes and PT stats, I make more bb/100 in NL by half-stacking than I do with a full stack. Just keep in mind that set hunting and calling raises with SCs is less effective when short-stacking.