I have two .17 Hornets barrels for the Thompson Center TCR's (the discontinued hammerless break-over rifles). The light barrel shoots about 3/4 MOA and the heavy barrel shoots better than 5/8 MOA. I have two loads, the 20-gr Hornaday at 3,650 fps and the 15-gr Berger HP at 3,950 fps. The 20-gr Hornadays are within one inch of the crosshairs to 200 yards and the 15-gr Bergers are within a half inch of the crosshairs to 150 yards with the same sight settings. With the 20-gr Hornadays I've killed two short range coyotes and several fox, one at 220 yards. All died very quickly. The 15-gr Bergers are relatively safe for aerial targets as they don't weigh much and have the ballistic coeficient of a ping pong ball. They work well on crows, and on squirrels with head shots. With the 20-gr Hornadays it is much better in the wind than my .17 HMR and has a lot more thump. The .17 Hornets do not seem to copper foul barrels at all and I have read that barrel life should be over 10,000 rounds. My .17 Remington burned out two barrels, both in less than 1,000 rounds. I have had some necks split on my first .22 Hornet cases made into .17 Hornets, but I did not anneal the necks after necking them down. That may have helped as going fron .22 to .17 is a big jump. Some cases have now been used for six or so loads and are still OK. The .17 Hornets don't have the range of my .220 Rocket or my 6mm-06, but if I were limited to one pure varmint rifle it would be a .17 Hornet.