Every time one of these threads comes up, it amuses me how many people comment who have never (or rarely) shot a moose.
Your SST's will work fine, but do make a mess on a shoulder hit. Moose will be dead though, so it's probably academic. If you need to pick something else to make you feel better about a once in a lifetime hunt, then just go with whatever one has the nicest box. I've seen 7 mags be pretty effective with accubonds if that helps, but wouldn't hesitate to use about anything on the heavy end of things. Copper works ok, but isn't needed.
Not sure how many moose I've helped take apart, but it's in the multiple dozens. Some bullets make more bloodshot than others, but the difference isn't huge. Hit them on the shoulder knuckle, and it's always a big mess regardless. Square up on the lungs and it doesn't matter what you smack them with.
Only time I've seen really poor performance was light (150 gr / 30 cal) for caliber bullets at longer ranges or old school heavy for caliber (220 gr) round nose stuff. Penetration was an issue in both cases, but the meat ended up on the pole anyway.
Have a good hunt.