You can kill cottontails with sarcasm, or a dirty look.
My favorite SG ammo is RWS SSHPs. Only squirrels so far, but it shoots really well in just about everything. Bought some really cheap last year. Regret bitterly that I didn’t get more.
That's great small game ammo and super accurate.
I got a case last year from SGammo and like you, wish I had gotten about 5