Anyone try the Dust Devil BB's yet?https://www.pyramydair.com/product/air-venturi-dust-devil-frangible-bbs-1-500-ct?p=1477
Haven’t tried gamo round balls in my 880, but the h&n round ball shoots great in it.I did try some gamo rb’s in my 392 and they did very well in it.The only problem I had running them through the reservoir in the 880 was as I was seating a ball with the bolt, the next one in the reservoir would get shaved a bit by the side of the bolt, affecting accuracy.... single loading gave the tightest groups.I suppose when running them through the reservoir, you could lean the rifle over a bit so the next one in line isn’t trying to come out of the B.B. hole and doesn’t get shaved by the bolt. Thought about it, but haven’t tried it yet.
The lead BB's should not roll out the barrel. They are pretty close to .177 to be scored by rifling......they are designed that way. Steel BB's are closer to .173-.175.