RE: Hunting With Slugs Help!
I have the same rig as you. First of all, you need a sighting system. Do you have a scope or rifle sites on your gun? Precise aiming makes a BIG difference. If you want to stick with your smooth bore just buy the less expensive "Foster" style rifled slugs that most every ammo maker has. My gun likes the Winchester brand the best but yours may be different. I confidently shoot out to 75 yards with no problems. 3" slugs offer no advantage other than pounding your shoulder and wallet a lot more than 2.75". Use the most open choke that you have...probably improved cylinder unless you happen to have a skeet tube. If you go with the rifled bbl you will need to buy the MUCH more expensive sabot type slugs. I don't have this type of rig so I will not comment on whether it would be an advantage for you or not. One important question is how far do you expect to shoot?
HTHs and good luck.