C-GHGR Holdings-Cessna 525 aircraft-Engine Cowling Departure

C-GOJG, a Cessna 525 aircraft, operated by C-GHGR Holdings, was enroute from Casper (KCPR), WY to Western Nebraska Regional/William B Heilig Field/Scottsbluff (KBFF), NE, with the pilot and 4 passengers on board. During cruise at 25000 feet ASL, the pilot heard a bang followed by a sudden, slight change in pitch attitude. The pilot immediately regained pitch control and continued to destination. An emergency was declared and the aircraft landed uneventfully. An inspection revealed that the right lower engine cowling departed the aircraft and struck the outer portion of the right horizontal stab. The aircraft remained in Scottsbluff, Nebraska for repairs.