This is an interesting thread. Perhaps it would be helpful for the posters to note the vintage of the dg they own and shoot. This information may be most helpful; eg. older more delicate dg versus new more robust dg. I shoot and hunt with my newer dg, and have no problem with mono nor any other kind of bullets. I am getting the impression from this thread that the older English dg require a lot of tlc and caution regarding bullet content and powder. Is factory ammo a problem with the older dg? Do all the owners of these guns reload? I would really like to know. thanks, I truly appreciate the diverse knowledge and opinons expressed here. I would really like to read more first hand accounts of actual problems and solutions, etc.