Today my friend and I used 22 LR Winchester 555 bulk ammo. We usually use Federal Champion 22LR. We had no choice because Big 5 Sporting Goods decided to stop carrying Federal. So today at the range we realized that Winchester was dirty and inconsistent. We kept having to adjust our scopes due to it not landing wear it was initially hitting. While Federal we adjusted our scopes only to tune our scopes and we didn't have to touch it even after multiple range visits with Federal ammo. So Federal is our ammo of choice. Winchester is GARBAGE!!