So I’m not sure where to post this, but if I had an idea for an invention that would help shooting long range and/ or with teaching the fundamentals of marksmanship, who should/could I talk to? Would I be better of building a prototype?
Do you have the means and ability to do so? If the answer is yes, then you need to decide- if you do this and are a go, do you need to partner up? If so at what point? Capital, production, design, marketing, fabricating, testing, etc.
If so who would be the best option for each/ all step(s)? What need would it fill specifically? How is it different (or better) than x.
Once you still decide it's a go, swing for the fence. Patent process (as mentioned above) before partnering, and dedicate to it. Every person, entity, contractor, etc is potentially a liability or competitor, or best ally.
Fortune favors the bold, but poverty favors the unprepared.
All the best of luck in your endeavors.