This triplet consists of M65, M66, and NGC 3628 (Hamburger Galaxy). A significant number of extremely distant DSOs are peppered throughout the background (the astrometric solution labeled 15). The trio is relatively bright so 5 hrs 36 min of integration seems to have been sufficient in my relatively dark skies. My subs were all 180 sec.
ASI2400MC Pro and William Optics 156mm APO mounted on an iOptron CEM120