I got to be on glass several times for Mike at Mile High shooting a .224 Valkyrie at the local match 3 weeks ago, 87 to 1124 yards. It was challenging past about 700 yards to see impacts on target, splashes in dirt berms and impossible in grass, but I don't think I missed any impacts. On stationary high quality glass, I saw 90% of the traces from the 6mms on up, only caught 2 from the .224V. I have a good amount of experience spotting .223s on long steel and the .224V was a little better, but closer to 77s from a .223 than 105s from a 6mm. Noise of impact was faint at best even without ear pro in on the really long stuff. If I was shooting 224V at a precision match, I would want a really good spotter on glass. All that said, I ordered a 22" JP barrel before SHOT.