Ihave a 54 in 270 and never shot it. My son wants to use it this year so we dug it out and it shoots cast real good but he wants to use it out to 250 yards. So to jackets we go and now the question. Are there any tricks to tuning these guns with the barrel stud? Should they be snug, loose or cranked tight? I have a limited amount of bullets and I am seeking a shortcut to better groups.