didn't know there was but one out there and I have it. I shot it a good bit with nitros to many varying patterns. high of 368 down to mid 250s or so. I tried many different loads..i always liked the h51013a loads, but they always insisted on the heavy 2 7/16 load. it never shot good for me.
just ask William about my patterns when he first built it, pitiful. also shot the rhino for comparison, and still no better...in my gun anyway. that choke will shoot the nitros better than a tight one, but finding consistency in the loads was always my troubles. both guns I had were 20" bbl guns too. the old 2010 loads that many had troubles with overpressure were my best shooters
with the constant change in loads, shells, or something I eventually went away from them. also the megaweight loads did me in, literally. ive never been kicked so hard. screw that..off to the 20 ga world and tss and haven't looked back.