Wow, that is some serious inletting work there! Lots of QUALITY labor embodied in this piece! On a pedantic note, Baker's baby was not a two bore but a four bore firing 1/2 pound conicals which led to the confusion. He wrote of firing charges well beyond 16 drams. I hate to say this but I would worry about penetration on elephant with "only" 10-12 drams pushing a 3500 grain ball. Such charges were fine for 8 bores but were probably considered very light even for the four bores (as Baker's writings indicate)....much less something like this beast. A charge of 275 grains in my 16.5 pound 8 bore is VERY tolerable so, given the weight of this thing, I would start at 15 drams and work up to your tolerance.

Hope this helps.

John