So you only have 20 huntable acres and you are relying on resources from the neighbor's property to make your hunting viable and you are upset because they started doing stuff on their property that is affecting your hunting???

Knowing that you have such a small, huntable property, you need to work on making improvements to make it more viable for deer, hogs, or whatever. You can't rely on what isn't yours. You may have to do some work to make your little property independently viable.

Why can't you hunt on the other 30 odd acres of your property?

Try talking to your neighbors and seeing if you can work something out with them. That is always a good idea, but with that said, don't expect them to comply with your wishes. They have ever bit as much right to utilize their property for their desires as you do for yours. If they say NO, then you have to go along with it.

I did notice that nowhere did you indicate that your neighbors are appearing to act in any sort of intentionally rude or disruptive manner. They are not trying to thwart your hunting, just making recreational use of a pretty spot on their property.

Maybe you can ask to lease their hunting rights, and maybe ask that they not camp during the season? Might be worth throwing some money at, depending on the LO.

So you only have 20 huntable acres and you are relying on resources from the neighbor's property to make your hunting viable and you are upset because they started doing stuff on their property that is affecting your hunting???

I think talking with them is the answer. Make sure they understand the boundaries and that trespassing will not be tolerated. It sounds like they don't really care much about deer hunting. If that's the case all you can do is manage it as best you can.

Point being - don't be so quick to judge or claim that you cannot hunt a small parcel safely and successfully.