I picked up a Sportsman a while ago and finally took it to the range to see what it liked. I had some Rem. Golden bullets and sub-sonics a box of Winchester super x and some CCI long rifles and CB rounds. The CCI long rifles loaded and fired fine as well as the golden bullets. the Remington sub sonics would not go into the cylinder at all. The Winchesters went in tight but after firing a few the cylinder would not advance and the fired rounds seemed to have a rounded base that was rubbing and binding. I fired the CB rounds last so as to not muck up the chambers and they were fine.
At home i measured a few unfired rounds and found that the Winchester cases(.225) were about a thousandth larger than the CCI(.224) and the sub-sonics had a bullet that was at .225. I used a Starret mic.
I have no problem with any of these rounds in several other guns and was wondering if the H&R sportsman is known for tight chambers
by the way the little H&R 622 that i have likes everything i put in it.
Thanks
Michael