I have the 1300 pump with a 26" as well. Carry that in thick Northern Ontario bush partridge hunting and I have never once even thought about having a shorter barrel. Also have used it with Brenecki rifled slugs for deer hunting and can group 2" patterns at 100 yds. Turkey hunting you generally just are sitting and the longer barrel gives me a good sight line. Using an Undertaker choke tube I pattern it with Remington Magnum 4x6 Turkey Load 2 3/4 and it's fine out to 35 yds. (haven't patterned beyond that but at 35 there is lots of shot in the kill zone)

I've only ever heard of negatives for the shorter barrels.