Couple things to think about. 1st Does it have a muzzle brake? If so, do everything you can to wear hearing protection when firing. The muzzle blast will cause permanent hearing damage to you and especially anyone that might be alongside you. Obviosly when you are hunting this might not be possible, but at least you are behind the gun not to the sides. 2nd Many bolt action shotgun stocks are too low for a proper sight picture. If you find yourself lifting your cheek up off the stock while aiming, consider a comb raising kit. (@20$ bear tooth products). 3rd Make sure the trigger works well, if not have it reworked or get an aftermarket drop in trigger.
Once these little tweaks are done, but before you hit the range to sight in, there is the most important question to ask. How far are you realistically going to shoot?.... 50-75 yrds...any current Sabot slug will work...75 to 100 yrd....now you must choose between Sabots that are accurate in your gun, versus your ability to judge range and drop. For example some might shoot tight groups but have a terrible trajectory...125-150 yrds...until recently an ureasonable expectation for most. But now a real possibilty, with one choice of sabot. The Remington Core Lokt Ultra, sighted in 1.8in high at 50yrd, its 2.8 high at 100yds, and dead on at 150!
Hope this helps....BTW I own the Savage 210, 12ga w/ a comb kit, and leupold 1x4 vxII, (upgrading to the 2-7X33 and having a Timney drop in trigger installed this weekend). With my current set up and a target rest, I get 2in groups at 100yrds with Core Lokt's. In fact the Core Lokt shoot the best groups out of my gun. (Lightfields also shoot very well but the trajectory is no comparison)