Remington Premier Core-Lokt Ultra Bonded 2-3/4" Sabot Slug is what I shoot but I use the 12 ga.
It is the flattest shooting slug I have found, Remington recommends that you zero your gun at 150 yds with these slugs but a 200yd shot is no problem.
Here are a few links to them online.
http://www.cheaperthandirt.com/product/56229

http://www.gandermountain.com/modperl/product/details.cgi?i=414784

http://www.cabelas.com/product/Remington-Core-Lokt-Ultra-Bonded-Sabot-Slugs/705475.uts

http://www.hyattgunstore.com/reming...a-2-3-4-5-8-oz-copper-slug-5-rounds.html

Or you could just bring another loaded Muzzy to have a back-up shot........er if you can get the smoke to clear fast enough from the first shot. LOL