Ok i was out to the range with my .303 #4 mark1 barrel is mint for land and grooves 5 twist. for sights i have a parker hale t.z. 4\47 rear appiture. i was shooting 50 yards with 180 grain win and 180 ammo that the nfld rangers use and 95 % of the shots didnt even hit paper and the few that did was way low or way high or had to do about 25 yards we tried adjusting the elevation in small incermints and nothing helped bring it in. i spoke to my sister's bf and he said i should go down to 150 grain and should hit paper at lower grains. i never heard of that prob, but is it possible that could be the anwser to this prob.