I shot them out of CVA optima for awhile. They shoot pretty good, not tack driving, but probably 2-2.5 MOA. Killed a smaller doe with them. bullet works exactly as shown on website. Found the petals under hide on offside shoulder. Would have to check my notes, but i think i ended up using the harvester crushed rib sabots with them instead of the ones supplied by cutting edge. Shot them in my smokeless savage before i sold it. Required a sub base for the sabot to survive. Not sure if your UML will require a sub base or not.