You most probably find this information at the Public Records office, Kew, London. I made a visit when i was researching the 2" mortar, found lots of information regarding wound effects and ballistics’s evaluations regarding the 36 mills bomb 2"inch mortar and 25 pounder also reports about the effectiveness of the 2" mortar in action, plus proposed developments from the field that never took off. So you may find something here.