Caravan 208A
Flight Crew Multiengine; Flight Crew Commercial; Flight Crew Instrument
Flight Crew Last 90 Days 150; Flight Crew Total 1350; Flight Crew Type 350
Communication Breakdown; Situational Awareness
Conflict NMAC
Flight Crew Took Evasive Action
Human Factors; Procedure
I was on a VFR approach Runway XX into ZZZ. I called Unicom at this time and announced I was planning for a straight in approach for Runway XX. When I called again for a 5-6 mile final an aircraft came on the radio to announce his position it came in garbled and unreadable; so I announced on Unicom 'last aircraft to call it was unreadable.' So Aircraft X repeated and announced that he was doing a dog leg to downwind for Runway XX. He was a light experimental aircraft and I am in a turboprop airplane on an about 5 mile final; so I continued my approach. After this; Aircraft X didn't make any other calls so I assumed he was still on downwind. I announced that I was on a 3 mile final; then a short final and this aircraft did not make any more calls. When I was very short final; less than half a mile before Runway XX something to my left caught my eye and I look over: Aircraft X was 10 feet or less descending on to me and turning into me. I made quick and sharp evasive maneuvers to the right to avoid what would have been a sure midair collision. When I saw I was clear of him (because I am a faster aircraft) I continued my landing. He was unprofessional on the radio afterwards telling me that I didn't have the right away (I was lower and on final when he decided to do a short approach and descend on top of me). I cleared the runway and got my passengers safely into the terminal.
Cessna 208 Captain reported an NMAC with aircraft not complying with normal pattern procedures; at non towered field.