The 45/50 Pellets are designed for in-line 45 caliber rifles. As with all Triple Seven products, clean-up is quick and easy with plain water. These Pellets may be used in 45 caliber rifles with saboted 40 caliber bullets for game from squirrel to deer. Designed for use with 209 shotshelll primers only. Mfg: Hodgdon Powder Co., Inc.