"i'd put my .17 HMR up against some of these single shot .22 LR's. i didn't take a pic of the score card but last time i was at the range i was shootin around .20" inch at 100 yards with the factory 5 round magazine an shooting Hornaday 17 grain V-Max."
Comparing a .17 HMR to a .22LR is more the cartridge than the rifle; the HMR's tend to be inherent tack-drivers. I have three single-shot NEFs - a .223, .17HMR, and 45-70. The .17 is like a laser, and the .223 can give me 1" at 200 yards. The problem with break-action rifles like the NEFs, you have to remove the rifle from its rest each time you reload it, so it's not the same as a repeater that you can leave in one position. My Ruger 10-22 is a prime example - I can shoot ragged 1-hole groups with it at 50yds using a full 10-round magazine, and come pretty close to it at 100. But that's partly because the only movement I make between shots is pulling the trigger.