Single shot .22 rimfire bolt rifle. (Rem 514 or similar).
H&R Topper .410 single shot.
Model 10
Model 36, 442 ( older J frame)
Savage .17 HMR (got a couple of models in mind)
Beretta Bobcat 21 A, .22 long rifle.
Lever action .357.
AR (Colt 6920 ?) simple, serious,
Ruger MKI or II, Standard, 4 3/4 bbl, fixed sights.
Some others...