TSSR
is the SSR with the 3" idler wheel the reason it is called the TSSR is because it is part of the total shooting system line up.
the only difference between the TSS and the TSSR is that the TSSR uses the 14" split limbs and the standard TSS uses the 15" split limb. the TSSR is about 3 Feet per second faster due to a shortre A to A and shorter Brace heighth TSSR IBO is about 303 FPS but HCA recommends using the Speed pro Max Arrows and broadheads for maximum bow preformance.
I have a Total Shooting System which includes the Bow Arrows and accessories which is very accurate and shooting 326 FPS at 28.5" draw length and pulling 67 Pounds.

I also won a couple of local 3d shoots using this bow last year.

any thing else you want to know about the HCA line
let me know Iwill try to answer for you if I can.