its hard to give you any advice on the topic but heres one corner to immediately cut if the gun has a 3 inch chamber dont even bother messing with 2 3/4 inch loads. Another thing to do is pick the loads by what projectile will fit your needs best. then out every one you picked try to boil it down to 3 to 4 loads buy a box or two of each and go at it, if you dont like the results then pick another 3 loads and go at it again the next weekend. another way to go at it is buy a 3 to 4 boxes of the least expensive loads get your gun roughly sighted in to the desired range if they dont group good then pick other slugs and shoot for groups and see what works. good luck