The skeet B will cycle anything. Unless the brass/alum./steel case head is faulty. But the older guns have pretty large chambers, not to many problems, if you do encounter failure to extract, check your extractor for wear, as they do wear and are cheap to replace, though can be difficult to do the acutal replacement.
Someone in an earlier post in this thread said their classic trap didn;t like light loads. I have classic trap new in march, and it cycles my 7/8 oz. soft reloads pefectly, have yet to have failure. I would suggest checking that you have you gas rings installed the correct way around, that you are using an o-ring with the proper thickness, I stick with the remington ones, they are more expensive but the work and last longer. Also check to see that you do not have a gas port blocked, or dirty, if they are there may not be enough gas getting to the action to cycle the gun.
Best of luck to both of you