Brent, it will be 25" if it's factory and hasn't been cut.
If your short barreled gun is also a Model 100, they have something of a cult following with grouse and woodcock hunters. Short barrels, light, relatively open chokes. But they are hard guns to shoot well at targets, because they are both short and light. Either put a beavertail forend on those guns (like the 200's or the 280's) to add a bit more weight forward, or make the barrels longer, like 28". Either will make for a better target gun. But the problem with the long barrels is that they're choked tighter, which means they aren't such a great choice for skeet. Too bad Ithaca didn't offer those 28" barreled Model 100's with more open chokes.
Try pre-mounting that short barreled SKB and shooting low house birds from station 7 on the skeet field. That will likely tell you if the gun isn't shooting where you aim it. If you're not hitting there, then a pattern board will tell you which way you're off, and how far. Or rather the gun's off, if you're pre-mounting.
