It was as follows,
1st HBVG.
Roll 1 = 6 Shots
Roll2 = Misfire (re rolled by engineer for 3rd role.)
Roll3 = Misfire (the re roll).
Roll 4 (3rd barrel) = Misfire.
Black Powder roll of 1 = remove HBVG1.
2nd HBVG
Roll 1 = Misfire (re rolled by engineer for 2nd role.)
Roll 2 = Misfire (the re roll)
Roll 3 = can't recall I think 6 Shots
Roll 4 (3rd final barrel) = can't recall maybe also 6.
Result halved for shots...