Thanks guys.
I have just used some Remington factory ammo so far. Getting 1/2 inch groups at 100 yards as well. I also mounted a Bushnell 3500 - 40mm with target knobs...very nice. I got a great deal on it through the Optics for sale forum. I also just picked up a 4500 - 50mm scope off of the forum as well. Haven't mounted it on anything yet.
I like Nosler ballistic tips in my bolt guns but I don't know how the tip will hold up in an automatic. I know the bullet slams into the top of the chamber throat very hard. I will have to do some experimenting.