There really isnt a cheap way of doing it. My advice is to have it boresighted, throw some cheap slugs through it to make sure your on the paper, from there on your just going to have to experiment with different kinds of sabots to see what performs best in your gun. I shoot an 11-87 with hornady sst's. My 3shot group at 50 i can pretty much have each slug hole touching each other. I've never really measured my groups wiith the shotgun but out to 150 yards i can keep 3 shots in a grapefruit sized grouping, and a paper plate sized out to 200. I tried the remington accutips a few weeks but couldnt keep the groups as tight. I'm also doing all of my shooting out of a lead sled with 40 lbs of sand to hold her down.