calling raises with small pocket pairs

[tgo007]

alright I know it is +ev to call with a small pocket pair to try to flop a set because if villian has AA/KK he might lose his whole stack.

My question is how big of a raise should you be willing to call?

I know u hit a set 1 out of 8 times, but that doesn't mean u should call raises that are 8xbb (assuming 100bb stacks).

I have been following a 10x rule instead but I am starting to think maybe that is still not good because u will not win villian's stack often enough for it to be profitable.

I am thinking of following a 15x or 20x rule instead. Anything wrong with this?

P.S. I play NL100 so the players are decent.