Gotta get a slug gun for a specific hunting area

[libertyman777]

I'd like some help wading through the choices.

I could spend $500 if I had to but I don't want to. The area in question is a Military installation and they are very strict as to what you can use. Shotguns with slug only.

I'm leaning in the direction of the Mossberg slug guns (500 series) but there are so many variables.

Based on what I've read here and other places, twist rate is a concern with some of the choices. Who is offering the best all around twist rate for stabilizing the greatest variety of projectiles.

Thanks,

Paul