Performance is down by 20-25%, just like the sizing would indicate. Iffy feed on most Mossberg's with the open shell lifter (add a piece of vacuum tubing to the tab if you want to try it). May or may not work on a 1300 Winchester, gun dependent. Ran out of patience before trying to wring them out in an 870. My guess(?) feed problems galore in any auto loader. I'm sure someone, somewhere, at sometime has managed to get them to run well out of both slides and auto's. I just didn't have the patience or interest enough to do so.
The loads true sweet spot would seem to be in a SxS or O/U application. For someone too physically challenged to use even 2 3/4". I seem to recall a test of them one time in the Box Of Truth section-but don't quote me?
JOMO?