Originally Posted by WiZZiM
Depends on a trillion differing variables.
True, but we might still be able to give some guidelines here.
The OP seems to be about situations where we have a decent stack (say 15BB) and are thinking about stealing from a blind with a shortstack (say 6BB), where losing all in to them would leave us in a weak position. The problem is that a standard 3BB steal raise followed by the shortstack's shove would leave us with a 3BB call into a 9.5BB pot - we are almost obliged to call here because the odds are so good. We have got ourselves into a pickle with our J7o type rubbish - calling off a quarter of our stack with pretty nasty cards.
So, what else to do? We could open for 6BB and give the shortstack the wrong odds to call - but again we are getting in trouble with our J7o as we are only getting called by better hands. I will often min raise steal, the min raise is usually enough to do the job but will allow us to fold if the villain fights back.
As Wizz says there are plenty of variables but in general terms we should look at the our stack and the villain's stack when sizing our bets. If, for example we have AA in the small blind and the BB is short we want to put in a bet that will tempt the BB into shoving - if we raise half their stack then they will not think they can scare us off with a shove but if we bet too small the pot might not be big enough for them to risk a resteal.