Lightning strike will take you to 120.
But if you really want to use momentum strike, try taking a weapon with mana leech, LIFE leech and hitting the Yomotsu warriors (if weapon skill > 100) or Troglodytes (if weapon skill < 100). Use a 70 physical resist suit of armor with 45% DCI.
There's a very small chance that you actually die in this activity if you never heal yourself, and no chance at all if you do heal yourself.
You leech enough mana from every strike so there's no delay while you wait for mana and you leech enough life to counter the hits against you, just from your weapon alone.
Note: this doesn't work well if you don't have parry already trained or low DCI.