I agree with you biku324 , I have the " 94 " marlin in 44-40 . Mine has a low 3 digit serial # so must of been made around 93-94 . The groove diameter is .426 so I size my cast bullets .427 . It is in great condition and a real shooter . I have wanted a revolver in same caliber and have looked at the S&W 544 numerous times . The search continues . Regards Paul