I have 300 rounds through my 10T and it shoots absolutely fantastic. It started off about an inch and a quarter. I cleaned it after every 5 rounds until i hit 20. I haven't cleaned it since and it just shot better and better until i hit 60. When i got done shooting for the year it was at about 5/8 of an inch. My brother can stack them with that gun, but he is better than me. At the end of the year i just ran an oil patch, no solvent... it wasn't ready for cleaning yet.