Originally Posted by jim march
You pretty much have to use them in a single-shot or AS a single-shot.
No, you don't. I can tell you for a fact that they function perfectly fine through a Mossberg 590 pump and a Remington 1100. I used them in a 3 gun match (probably about 2 dozen rounds each) just for the heck of it several years ago.
There is no need to completely cut through the hull. Either score it all the way around without cutting through, or cut completely through it from 2 sides stopping short of the middle, leaving a couple of 3/8 inch wide bands to hold it together.
If you don't cut far enough, the worst thing that happens is the shell functions normally.