Mossberg 500 Trophy Slugster Barrel
Buzzard, I just bought Mossberg's Trophy Slugster Barrel for my model 500 for a limited slug shotgun/muzzleloader hog hunt. It comes with a cantilever scope mount and porting. The scope mount is long enough to use standard eye-relief scopes. I topped it off with a set of rings and a Simmons 3-9X40. You can find the barrel online from either Cabelas or Bass Pro Shops (as other places I am sure) for around $150, but my local shop was able to order it for $30 less. The only downside is all the local gun shops are out of sabot slugs at this time and my only option are rifled slugs. I do not have any experience shooting slugs either, but everything I have heard and read suggest sabot's are the way to go, especially with rifled bores. As soon as I sight in, I'll let you know the results.
BTW, I also ordered a new limbsaver recoil pad and sling stud mounts. Local folks I talked to reported that the limbsaver didn't make a night/day difference in recoil, but did take the sting out it. Also, this combo is not light. After hoisting it around a while in the garage, it was readily apparent a sling is needed if you are going to do any significant walking/stalking.
Hope this helps a little. I'll let you know the shooting results.