I am looking at the Riffe mid handle series for hunting Tuna. However, I am having a difficult time deciding what size to get. I was going to get the #W which has a gun length of 67 inches, but a few people told me that this is too big. I was wondering if someone can give me some advice. I am going to be going after Tuna, but I wouldn't mind being able to use it for other things also. I also have a 42" gun for reef fish. What size should this next gun be?