Are you using slugs or buckshot?
in either case, it's worth it to find out where the gun shoots. If you are using the same barrel you used for geese, don't expect that buckshot will pattern like other types of shot, it might, but it might not too.
Slugs are another matter. If you are shooting slugs from asmooth bore, sight it in, some guns just don't shoot slugs well. You may have to try a few brands to get one your gun likes.
Tree stand hunting this time of year can be a tad frosty. You'll likely need more than you took for the regular gun hunt to stay warm.
Good luck.