Ballistics for a .327 Mag. with a 100 grain bullet are identical to 9mm 100 grain. Most 9mm handguns carry twice the number of rounds, are lighter, smaller, easier to find ammo for, FAR cheaper to shoot, and you can get all kinds of carbines in 9mm to share ammo with. If S ever does HTF odds of you finding somebody else to get 9mm ammo from are just a little higher than the .327 (store shelves, second hand sales, whatever).
Makes me think even more .327 was born a white rhino, and will stay one.