Lots of good points have been raised. The only thing I have to add is depending on the dynamics of your ideal relationship, whether your SO respects you as an equal partner could be an important factor.
Personally, I find it awesome that my SO also enjoys shooting. She may not be as committed as I am, but she understands that this is primarily my hobby and I am financially responsible enough to not jeopardize other aspects of our lives. On the flip side she has her hobbies which I support and encourage her to pursue, even if it isn't my cup of tea (incidentally, we both enjoy tea also).