Why would you want to use Buck shots ongames when slugs these days are very accurate out of this gun , unless you are going to use it for SD purposes?Anyway to answeryour question, my A-5 really like #1 buck and it shoot a tight pattern out to 45 yards. My A-5 get clover leafs with slugs at 50 yards and 2-3" at 100yards, this is with a smooth bore and iron site.
Great gun and you should enjoy your new toy.