I BOUGHT AN 8 BORE DOUBLE RIFLE ONCE OWNED BY JACK LOTT

This is the Biggest cal double rifle I now own. And I love the Jack Lott history - as written and pictured in both the 1983 and 1995 editions of "Big Bore Rifles" by Jack Lott. I always wanted an 8-bore double rifle, and when this one came up for sale I unloaded a bunch of iron to buy it. All the specs are shown above the pictures. I am anxious to get to the range to test it, but need help with loading recommendations. Since it has steel barrels, I intend to load "nitro-for-black" cartridges. Again, your help would be appreciated.

(I also have 2 other rifles attributed to Jack Lott. Picture links are below. The first is a Custom 458 Mauser. The second is a Custom 458 Browning. Both these are also written and pictured in both the 1983 and 1995 editions of "Big Bore Rifles" by Jack Lott.)
http://buckstix.com/buckpics/lotts0.jpg
http://buckstix.com/buckpics/lott-3a.jpg
http://buckstix.com/buckpics/1983magazine.jpg
http://buckstix.com/buckpics/filinga.jpg

http://buckstix.com/buckpics/lott2-1.jpg
http://buckstix.com/buckpics/lott2-5.jpg
http://buckstix.com/buckpics/lott2-6.jpg
http://buckstix.com/buckpics/lott2-8.jpg

http://www.buckstix.com/buckpics/rodda-000.jpg

Here is another write-up I found about this double.

http://www.buckstix.com/buckpics/rodda-0000.jpg