Sounds like a .223 M70 I had back in the late 80s. Would not hit an 8 1/2 x 11 inch piece of paper at 100 yards. Hit it once at fifty but bullet was in full keyhole mode. Winchester said was not anything wrong with gun but it was unsafe as I had adjusted the trigger down from 15 pounds. Turned the gunm into an Bropwing Auto 5 12 ga. Problem solved.