Yeah, i need to, but so far I treat the shotgun like a big carbine. Same manual of arms nearly and its worked just fine, with the exception of "if youre not shooting, be loading". Mag capacity seems to be about the only difference. Malfunction clearance drill is VERY slightly different (you don't check to see if the mag is seated), but otherwise it's just "Rack, Bang."
In fact, the other day I had a shell that was charged light, as best I can tell. Had no expectation of this failure coming. Treated it just like a carbine that couldn't have mag issues.