I have a Maynard carbine and ordered brass from Lodgewood for it. I see people saying you use .515 bullets but the case throat measures .503 . I tired to get a .515 in the case but it was a no go. What size bullet is best for this. I tried to find a .505 and no one seems to have that size. I bought some .501 but that won't seat in the cast, although it does fire. Also how do you clean out the area , after taking the nipple off, between the nipple hole and the barrel. I tried a very small wire as well as a pipe cleaner and they were a no go. Thanks