You will have to check the box for the slug weight, but usually the only difference in a 3" mag slug is more powder, more recoil. In my experience, the slug barrels commonly available from the big firearm manufacturers usually shoot the cheaper, and a bit lower velocity sabots better than the high velocity sabots. This has to do with the twist rate in most factory barrels not being optimal for the higher velocity sabots. I would try the cheaper Federal or Winchester slugs first. Then if the results are not what you want, you can move up to others. The Lightfields also have a good reputation.