There are no indicators to make one believe so. I don't believe there is any difference than if the shell were fired normally, and if so it wouldn't matter. You see, by the time a shot charge, cut shell or any kind of projectile reaches the end of the barrel pressures have dropped WAY below maximum chamber pressure, which occures when the projectile, or shot charge is only inches from the case, and with some loads, perhaps while the charge is still partly inside the case. A better and more accurate way to visulize what happens when the choke is hit is that the constriction slows the projectile a little, maybe. - In my more salad years I made up some slugs which were just under bore diameter, without lube grooves or lubrication of any kind. When they hit a full choke there was pretty heavy leading with just one shot, but no indicators of pressure changing, and the choke did not get larger, or banna peel, which would probably have happened if sizing pressure against the barrel would have been anything like a normal person would suspect. The choke on this particular 16 guage single shot, was precisely 18 1/2 inches from the breech, which is where I had sawed the barrel off. I didn't like the open bore, so split the barrel with a hack saw, length wise, for about 1 1/4 inches, closed it up a bit tighter than a full choke and gas welded it using chrome moly rod. I then squeezed the choke round as I could and polished the inside. It definately shot extra full, but a bit to one side, as I didn't get it perfectly straight. One thing for sure, my weld wasn't as strong as the original barrel, it was extra full, yet it didn't show stress from my stupid slug experimenting. Read those last three words again before you try duplicating what I did!
I smile every time I see the interest in this post. Makes me feel good to be an american with all the rest of you! To my mind there is a bit of freedom in just knowing this little trick, even though one may not ever need to use it. I haven't shot one for probably 20 years, except to show some young hunters here, but I feel good knowing this trick and spreading it around.
A couple of days ago it occured to me that I hadn't rightly explained what happens when cut shells are used in auto loaders, and to a lesser degree in pump guns. The short stub shell cocks a bit and binds, when the ejector jerks to hard on one side, and normally stays in the gun. It's a hassle to get the empty out with an auto, but worth it if you must get feed yourself and shot is the only thing you have when a big animal shows up for dinner. With a pump, the hull comes out fairly easy by jiggling the action a few times. With a bolt gun this will happen naturally, and with any break barrel gun, there are no problems with ejection.