With approx. 4000 ft.lbs of energy, any 12 gauge slug, placed accurately, will work!
Here's a thread in which Brobee compared penetration of three types of slugs in ballistic jelly. The Foster type (Winchester) hollow point slugs were terrible (14") compared to a Federal Truball (32.5") or Royal Brenneke slug (29"). The Foster expands into a flat washer, the Federal didn't expand at all with its copper plating mainly intact, and the Brenneke expanded a small amount leaving 12 sharp points around the circumference.
Score (Canadian) makes a copy of the Brenneke type slugs and they should perform very similarly. True Brenneke slugs are like hen's teeth in Canada. Ammosupply.ca has the Score slugs for $159/200 or $8.49/10.
Cheers,
GMC
shoot what's most accurate in your gun you are sending a heavy piece of lead down range it dose not need to be going 1600fps to do its job it needs to be accurate. my go to shotgun slug for my smooth bore is a home cast/home loaded lee foster slug it is only moving at about 1350 fps as im using a target shell load data its accounted for a deer so far. everybody thinks you need to get things moving as fast as you can but when you are talking about a pure lead slug slow is better drive them too fast and they break apart and flatten out like no tomorrow(some factory slugs do this)
Have you looked into using those Lyman 525 grain slugs? I bought a mold for it and casted a bunch, but I don't have any shot shell reloading equipment for them. I thought they were a pretty neat slug, but I haven't read too much on their terminal performance, or even accuracy for that matter.



























