Since you have a slug barrel, my suggestion would be
Remington, 12 Gauge, 2 3/4" Copper Solid Sabot Slug
- See more at: http://www.sportsmansguide.com/product/index/remington-12-gauge-2-3-4-copper-solid-sabot-slug-5-rounds?a=1587178#sthash.fMxSCoI7.dpuf - I love them.:cool: