I would suggest some 3 inch sabot slugs (if possible). Also try to find high velocity slugs. also. Look at Dicks sporting goods, they have good ammo deals. Finally make sure your gun is sighted in and be ready for a follow up shot after the intial shot. Good luck, and be safe.

I've heard nothing but good things about Brenneke slugs. I've also heard about deer that were well hit with shotgun slugs that were never recovered. The common theme with lost deer seems to be the distance at which the shot was taken. When it gets close to 100 yards, it becomes very iffy. Under 50 yards is a slam dunk. Good hunting and good luck.

If you have a riffled barrel go for sabot slugs. My favorite are the Remington Buckhammers and Hastings laser sabots. If its a smoothbore gun some sort of rifled slugs, but dont buy cheep ones.

When I had my 870 I had it set up the first shot was a slug rifled due to the smoothbore, Second shot was 00buckshot 3". Shells alternated from there. Theory was take the slug shot, if it runs take out the front legs with the shot. With the slugs you need to make sure if its a smoothbore to use rifled slugs and you need to be around 50 yds to have a good accurate shot. They tend to wander and drop alot.