Drill PokerFifteen blinds from middle position is 25 hands, 11.5% of combos: pairs from 55, suited aces from A9s, offsuit aces from AJo, kings from KTs and KQo, queens from QTs, JTs.
Push from MP, 15 BB stack
This is a "shoving is not yet a mistake" range, and it has to be read alongside the alternative. The top of the list — TT+, AQ+ — usually earns more at 15 BB through an open raise: you leave opponents room to make a mistake with a 3-bet or a call. The middle, though — 55–88, A9s–ATs, KQo — is exactly the material the shove exists for: raise-folding them gives away too much, raise-calling gets your stack in behind the opponent's range, and the all-in collects the fold equity in full.
Compare with 10 BB from the same seat: the small pairs 33–44, ATo, K9s and T9s are gone. Five extra blinds are five reasons the shove has to get through more often, and the bottom of the range can't carry them.
A separate note on the re-shove: if there has already been a raise in front of you, this chart doesn't apply — against an open, the all-in range is built differently and is noticeably tighter. The overall logic of the stack is on the 15 BB page.