Yes, but that's not going to happen, even for me.

I'll be making an MFer Hammerdin, focusing on Cow-killing (and the selling of meat). +96 from a 4Os Hauberk, +72 from a 3Os Crown, +100 from Gull, +40 from Nagels, +30 from Chancies, +30 from the runeword "Rhyme" Shield, +30 from Tal Rasha's/GoldWrap, and I have yet to find a +MF Boots (You can buy +30 from vendors in Hell). No Amulets yet with MF, probably +30 if I can find them, and several MF charms. At this point, I'm looking at 488% MF - boots, Amulet, Charms, leaving me at 400% MF. Conceivably, I could also make a Merc with (96+72) and Silence, making 656% MF if the Mercenary gets a kill.