Sell, give, or throw the gun away right now. I can already see you have stepped onto the slippery slope of being a handihalic. You will have more fun with these little rifles than is reasonable. I bought a 308 as a beater truck gun and I was hooked, now I have the 308, a 357, and 2 shotgun barrels. I am getting ready to get a 30-30, and 22 hornet. It is terrible, I have a lot of guns that used to see a lot of field time, now it seems to always be a handi, you'll see. As far as calibers, I would suggest a 357 for the pistol cartridge and a 223 for the varmint round, if you reload, the hornet is a great little round. Good shooting