Until I can decide on what 12 gauge pump I want for HD - I use a 12 gauge O/U shotgun with a 28” barrel and skeet chokes (equivelant to a 26” barrel semi - auto or pump 12 gauge) . I’ve added a 6 round saddle to the stock and jokingly call my set up : “ My slower loading 2 shot semi - auto 12 gauge” . What I have is better than not having a shotgun for HD and with practice loading the O/U from the 6 round saddle on the stock behind cover is a little faster than once thought it would be . My point is if a O/U 12 gauge shot gun is all you have for HD - then add a 6 shot saddle on the stock and practice loading to increase speed and reliability of your reloads . Two rounds already in the chamber with 6 more rounds in the saddle on the stock at the ready give you 8 rounds ready to put into action should the need arise … Better than a “sharp stick to the eye” until I decide on what 12 gauge pump I want !