Both Longshot and Universal have some 16ga utility.

I shoot the 16 as my primary gun and Unique is my favorite powder for 7/8 loads

I recommend you check out 16ga.com for more details http://16ga.com/forum/

One of the posters on 16ga.com (spr310) post a google spreadsheet that is outstanding as a base reference. try a look at it: https://spreadsheets.google.com/pub?key=twPtE--bpmSreSnuQt0i6XQ&output=html

Michael Dittamo
Topeka, KS