Semi custom M70 fwt 280 em. when zeroed it shot a 5 shot group that was sub half MOA. took it home and cleaned it thoroughly. took it back to the range today and the first shot was 6 inches low and 3 inches left. next two shots were and 2 inches left of center and dead center vertically. next shot was an inch further right adn an inche higher. the next several shots were dead center adn 2 inches high. Right where the original zero was. all I can think of is that the rifle likes to be dirty
Yep.. Most factory barrels shoot better when slightly fouled... I've had guys come in sayin' their rifles are thoroughly cleaned, yet shoot like crap.. I've told 'em to stop cleaning the dang thing UNTIL the groups start to open up..
Many have come back in later or called me to say 'you were right'..
