Luftwaffe gun camera film

I am looking for any information on Lt. Jurgen Hoerschelmann, of Stab. III, JG 3. On 18-3-1944 he shot down a B-17 near Lake Constance (Bodensee). On that same date, approximate time and place my uncle's B-17 was shot down, so I assume Lt. Hoerschelmann was involved in the fight. It was B -17 42-39967 of the 324th Bomb Squad, 91st Bomb Group, named Mary Kay,target Oberpheffenhoffen, MACR 3224. Some sources seem to indicate that gun camera film may exist, stored at Maxwell field in Alabama. I have been researching that to no avail.
There is very little information on Lt. Hoerschelmann, 18 confirmed, 44 claimed, KIA in 1944 (August if I remember correctly). Through the magic of the internet, I have been able to correspond with family members of most of the crew and recently someone who lived near Bodensee and had photos of the crash site. I have been active on the armyairforces.com and 91st BG sites, and been given tremendous help, however few seem to have any information on the Luftwaffe side. Any information on Lt. Hoerschelmann or avenues of investigation would be greatly appreciated. Thank you in advance.
Lou Illiano