George,
Your wads might be a bit slack, for the 14-bore.
Sometimes you can find a piece of pipe the right size, and sharpen it for cutting wads.
Cushion wads don't matter too much in a M/L.
Back in England, if shooting pigeons over laid corn, (Wheat, or barley) I used ivy leaves as wads. (So's not to set crop on fire)
An old gunsmith told me about this, and it works just fine!
If you can't find ivy leaves, any tough old leaf will work. just roll them in a ball and ram them down on your powder. Only thing is, don't leave t loaded overnight, as powder might get damp.
Used these for September ducks too.
A bit of dry grass on top of shot is all that's needed, , or less leaf.
Richard.