Well Skychief,
Initial trial, but first I lied to you.
My '14" seems to be a 16 bore now! Shrunk a bit since I last looked at it!
Minus 18C so didn't mess with it too long, but at 10 yards, patterns don't seem to be a problem.
I tried 2 drams, or 55 grains of 2F & 3F.
The 3 F kicked more but shot better patterns for some reason.
Shot was # 5. same volume as powder.
Tin can I fired at was a Heinz Baked Beans can.
The Only ones to penetrate the sides, were those that hit square on. the rest glanced off.
I tried a shot at the base of the can, and None penetrated.
This is just to let you know what I found up to now.
The can wasn't against anything solid, just plastic/cardboard, so penetration Might have been better if against solid.
These photos must be the most uninteresting ever put up on this forum!
Pics below;