Its been quite a few years since I used a shotgun w/ slugs for big game. When I did use slugs they were 2 3/4" Remingtons and they did the job if I did my part. Ironically those were the same slugs we used in the 870's when I was a rookie officer. We later switched to 2 3/4" Federal low recoil slugs. Both worked well for their intended purposes. Good luck!