I would not hesitate to recommend an SKB 100 or 200 20 ga. with 26" imp.cyl and mod chokes and it will handle the 2 3/4" x 3/4oz. #7 steel loads you want to use with no problem.IMHO they would make a very fine gun for snipe. Fast handling and very well made.
Good luck in your search.... Terry


Better to keep your mouth shut and be thought stupid,than open it and confirm.