Probably my fault ,,I started out shooting it with 3 pellets and and different bullets and it just wouldn't group the way I wanted..I went to 120 grains of triple 7 3f a crush ribbed blue sabot from harvester and a 40 cal.200 grain bullet I got from them and it turned into a tack driver.I have never tried another combo after that.I have taken the barrel out of the stock and shot it in a long range hunter stock and it grouped fine in that stock too.