1. In a 16 inch barrel, it's plenty of power, and it is a heavy projectile with relatively low speed. This means adequate penetration with virtually no danger of ricochet, especially with LSWC projectiles, unlike the .223 Remington or other high velocity rounds.

2. The turnbolt action will allow me time to think about each shot and its placement, and resist the desire for "spraying and praying". Precise fire sends the message that I mean business. Ranges being generally under 50 yards means iron sights are adequate.

3. I'm in a tower. It's a defensive situation. Prisoners don't have body armor and there is not a whole lot to build cover from in the yard. In a riot situation, I'm going to use the water cannon anyway. In any other situation, all I have to do is keep things static until the 'specialists' arrive.

4. I can share magazines with my side arm.

I had a friend suggest to me that the M203 would be a great choice. However the grenade launcher would be loaded with less than leathal rounds, such as CS, OC, stinger or multiple baton rounds. I thought this would be cool, however I like the idea of putting a halosight on it.

ohhh!! 308 would make big holes!!! But, only effective with a person that knows how to shoot. The cartridge may be to big and gun to heavy for a bunch of underpaid corrections officers who most likely only go and qualify once a year. Shooting at a target the size of Fat Albert.
The halosight would help-alot!

I think that a Sock Puppet trumps all else!!!