Hello to all, Again the dbigkahunna has given some good information. Things that have worked for me in running beads with 5P+, 70+ or HYP are try to keep your shoulders even when you have a land that is not even sometimes that can cause undercut. As was said when running the bead try not toget a big old keyhole. What seems to work for me is keep your rod 90 degrees more or less with the bevels try not to get any side angle unless you have some bad highlow and you are trying to catch the other bevel. I always try to keep my rod choked in the bevels with not really any keyhole between the leading edge of the rod and the completed bead it always seems to work pretty good for me. But I am no world renowed bead hand either. For space and shoulder I like a land about the thickness of a clear glass and the same space. Works good for me with either 1/8 or a 5/32. Another things to do is always make sure your inside edge has no rust can also cause hollow bead. Remember when you start getting into X60,65 and X70 pipe you need to have space because the pipe is harder than X42 or grade B pipe. When I was learning a welder that I helped showed me something that if you can not see the inside of the pipe. You can tell if you have internal undercut by looking at the apperance of the front side of the bead if it is a grey color, really shunk into the bevels and has no loose slag along its egdes that is usally a sign of internal undercut. When the bead is kinda bright with slag along the edges and kind of has a high crown to it for the most part should not have to much undercut on the inside. One more thing HYP and 70+ on the bead are not as forgiving as 5P+ is your space and shoulders need to be pretty uniform. These are just some thins that seem to work for me. Not saying they are right, wrong or otherwise. Good Night.