Hello Tony,
Admittedly I am here spectating from the "cheap seats", however I am questioning the 1-30 twist?
Looking at the very good picture of the left tube, and following a land around visually, it surely looks to me like 1/3 of a turn in the length of the bore.

Say about 23 1/2" actual rifled length x3 would be a twist of 1-70, which based upon my 8bore (1-90 ball rifle) and 12bore (1-50 conical or ball) would seem much more like it. DISCLAIMER: I do not have a 10 bore

Humble opinion? A 1-30 would be a very unusually fast twist for a bore rifle?
- Mike