16 gauge card & fiber wads would be unlikely to give a good seal in a 14 gauge barrel, & this would be particularly true should it turn out to be bored oversize for brass shells.

14 gauge = .693"; 14/1 = .701" & 13 = .710".
15 gauge = .677" & 15/1 = .685"

16 gauge = .662" & 16 gauge card & fiber wads have an OD of around +.020" or about .682". One can thus see they aren't going to seal in a .693" or larger bore.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra