I am still a novice regarding reloading for doublerifles...and my upcomming 10 bore will be no exception either. I have been reloading for all kinds of lever/bolt/singleshot rifles and revolvers...but as in all new fields, a good investigation on theories and practical knowledges is allways adviseable.
I have Graems book and find it very informative. There are allways something new one can learn..
yes..I have too read Ross Seyfried advice the IMR 3031 for equally grain for grain substitute for cordite in an old G&A artical. It did work in his articals..apparently...who can blame him??.