Board Thread:Off Topic/@comment-27144409-20181126150808/@comment-27144409-20190314003705

No, most slugs aren't rifled to my knowledge, and you do need to have some barrel length to retain effective killing power at any appreciable distance with shot, especially given the low caliber and the ruggedness of Grimm.

Also, even if you are using rifled slugs, you still need a barrel for that to properly work.