Congratulations!! Great hunt with a small bore. Good eating ahead!! You should be proud of yourself. It's no small accomplishment. Well done.
Once again someone proves that it doesn't take a large bore smoothy to get the job done. So much of what we "KNOW" today about shotgunning comes from the age of waterfowling.
Here in America the club butt fowlers & the Hudson Valley fowlers, both large bores, and both used for water birds, merged into large bore percussion smoothbore guns used for the same purpose. Once the mid-20th Century showed up, with its "Magnumitis" ideology, the small bores, ie. the 24 gauge, the 28 gauge, and the 32 gauge kind of got lost as specialist weapons, only to be used by "EXPERTS".
I am in the process of saving up for a 61" long, 28 gauge fowler barrel that will be similar to the barrel design of a Type G, Carolina trade gun. 0.550" bore diameter. It will be made into an Eastern Pennsylvania barn gun, brass-mounted, early Ketland flintlock, ambidextrous, windage-adjustable brass bead front sight, Lowell Haarer-style ghost ring rear sight mounted on the tang.
Breech/0"/1.1248" octagon (0.2874")
Breech/7.75"/0.852" octagon (0.151")
Transition/11.5"/0.732" round (0.091")
Waist/59.5"/0.660" round (.055")
Flared Muzzle/61"/0.768" round (0.109")
There are wedding bands at the 7.75" point & 11.5" point from the breech. The numbers in parentheses indicate barrel wall thickness. Weight of finished fowler should come in at around 7-7.5 pounds.