I verify the POI with all of my guns, especially with my carry ammo. Normally I do it at 20 Yards. I shoot supported, usually with a sand bag. I've had the best luck resting my wrists on the bag and holding the gun. I can normally get a sub 2" group without much effort. I like to use a white sheet of paper, with a dark/black index card in the middle.
After the sights are adjusted I use a silver sharpie to mark either side of the sight & dovetail. It's a visual reference point to quickly check for sight drift (over time).