If it's new it should have included a manual that will tell you what kind of projectiles and powder you can use in it. If it isn't new it wouldn't hurt to write Remington and request a copy of the manual.
I'd be extremely surprised if they recommend against using the pellets, though. A different question to ask is whether or not your game laws allow the use of pellets. Here in Colorado they do not.
One of the best ways to scout your hunting area is to look for signs that mature animals leave behind. Wallows, scrapes, rubs and areas littered with tracks are great evidence that game are using your area. But why not look for the single piece of evidence that you are hunting for when fall rolls around anyway... antlers. Game animals in the family cervidae shed their antlers annually. Why not use these unique souvenirs as a way of helping you fill your tag next fall?
Looking for sheds in your...