i also use a $130 gun I've taken atleast 1 deer a year with it no problems. I use 50 cal. 240 grain xtp bullets. I also use 90 grain of pyrodex. Are you useing the same bullet and powder mix every time? Make sure the gun is clean, then try cleaning it after every 10 shots or less. afriend of mine also has a more exspensive ml and he has a hard time hitting the same group he also uses the pellets instead of the powder. Sorry i wasn't much help good luck just keep trying different things hopefully its not the gun.