Alright, a couple of things here.

First people need to read around just a little bit before posting asking questions. This topic has been covered plenty of times, most recently in the Deer Hunting Section ( http://www.huntingnet.com/forum/tm.aspx?m=3414187 ). Topics can be searched by the SEARCH THE FORUM feature at the top of the page.

And secondly, each shotgun and each barrel has it's own preference as to which slugs shoot the most accurate out of them. There is NO general coverall recommendation. I suggest trying maybe 3 different brands and choose brands that are readily available in your area.

Once you get something to your liking I recommend buying as much as you can afford all from the same lot to retain as much uniformity in thm as possible.

Hasting's barrels have a 1 in 35 twist so you do not want any of the faster (1600fps +) ammo. The faster ammo is designed for faster twist rifling.

Keep the barrel clean! Clean it often, especially between trying different brands of slugs. 50, MAYBE 75 yards should give you the accuracy results you need to make a choice.

Good luck and good hunting.