Somebody Magnaported my 629, before cutting it back to 4”. It’s VERY accurate, BTW. It’s more concealable than the longer barrels.
Zombies, however, must BE SHOT IN THE HEAD. The Florida face-eater was no exception. Decent penetration is what you want. I use 250 gr Lyman gas checked slugs in mine. Fahgeddaht buckshot. 7.62 X 39mm hardball from a rifle should do the trick—IN THE HEAD!
I've never been a fan of Magnaporting handguns, for two main reasons:
1) It increases muzzle blast. In a confined space like your car or an ATM vestibule, you can kiss your hearing goodbye.
2) If the bad guy has managed to get within arms length, so that I need to shoot from the hip, the Magnaporting will direct muzzle gases up at my face. This can create a fatal distraction.