My father in law has an old 444 Marlin. He put a new 3x9 Nikon scope. Never had a bore scope down the barrel but by eye it looks OK. Today is the first time we had a chance to shoot it. Got it on paper, but could not get it to group under 5''s.The data I used was N120,44.0gr.,Speer 270 gr. gold dot. Does anyone have any good data on this or is this the best that this old gun can do.