I'll be crossing the border tomorrow at the Falcon Dam crossing. Whitetail deer hunt. Wish me luck!
Are you taking your own rifle, or using one that they provide?
I used to have a deer lease in Nuevo León, back almost 25 yrs ago. We used our own rifles, but we had papers for each rifle, and carried
only cartridges allowed for each. Driving our own vehicles, we were stopped by the Federales fairly regularly, typically at "check points." I never had a problem with them, though. Just said "soy cazador," showed them papers and the rifle and the ammunition. Usually offered them a cold beverage.
There were big deer on that lease! No hogs anywhere, but the red-winged black birds would often swarm in at our feeders by the hundreds and gobble up every kernel of corn.
Nowadays, though, I believe I'd feel a bit more anxious driving my own vehicle into Mexico, with or without a firearm.
Good luck! Hope you see some big ones.