Yeah I didnt think there were that many horse riders in MD to be able to sway the laws and if you are shooting at a horse thinking its a deer you got some problems any how...just made me shake my head at the no Sunday hunting law in MD...
In my experience (and my neighbor who is a groom and horseback riding instructor and one of those horse people agrees) horse people are often arrogant jerks. They can and should be allowed to ride where ever the heck they like whenever the heck they like. That includes private property. The only issue I have with sharing hunting property with horses is that at least a few horse folks like to go riding while trails are still saturated so it tears the hell out of them and makes walking trails or dragging game on them a horrible pain in the butt (looking at patuxent in particular).
I can almost grant recreational "other" users that on public lands on Sunday's not having to worry about hunters is nice. However there is ZERO reason hunting shouldn't be legal through out Maryland on private land on Sundays. Trespassing is no reason to shoot someone, but also if you are stupid enough to be riding horseback or hiking through someone's private property without permission and you take a round because you aren't wearing blaze orange well guess what, your fault.