I think it's a good idea to "shoot what you carry" every time you go to the range. That doesn't mean 100 rnds of the stuff, but enough to know your gun is reliable with it, and to know what to expect. I now only shoot carry ammo thru my snub. I've enough practice with it to know where they will go, and 20 rnds of premium ammo won't hurt my gun or my wallet.