I have a 380mm 177 for my crown. It's super . Will shoot slugs and 13.4 pellets,10.4 also. Single hole groups at 50 yards and depending wind at 100,but I have shot several 1 inch groups at 100 yards with it. I also have 500mm 22,and 25,and 600mm 30. I like the 177 the most. Good luck finding...