.22 Short
Granddad's old (1931) Remington Model 24 (J.M. Browning's semi-auto take-down design) is qery good at busting clay pigeons on the 100 yard line. Grandma used to head shoot the chickens with this rifle and Granddad used it to put dinner on the table more times than I can count and was doing so for 20 years before I came into the world.
Those shorts shoot surprisingly flat and are more than enough for small game.
