Two flints,
Congratulations an the Walnut Hill. Beautiful!!
My youngest son and I each have Stevens 414 Armory Models, his with Frank Zika soule tang sight and globe front-- mine is topped with a vintage Lyman 438 Field model scope and external adjustable mounts. We shoot quite a bit of .22 BPCR silhouette matches- ( watching rams tip over at 200 meters is always entertaining, and those darn tiny chickens at 50 are challenging) also mini buffalo gong matches out to 250 yards is just plain fun, and shooting 22s is a lot easier on the pocketbook as well.
A small-bore Single Shot rifle forum is a great idea.
For ammo, our 414s LOVE the Wolf Match ammo,(if I miss-- it's not the ammo or the rifles fault!!) it too is affordable(around $49.00 a brick here in Minnesota) for us it has been the most consistent, accurate ammo for the money. The Aguila Super is decent as well, and for plinking I had picked up a bunch of the Federal bulk packed ."22 Auto Match", it's at least "minute of squirrel".
I'm thinking that you are really going to enjoy your Walnut Hill.
Big Goose