I recently aquired a CZ455FS in 17HMR and am now enamored with this bore size. Impressed with the killing power these tiny frangible bullets have on ground squirrels. For a tiny 17gr bullet to do so much damage when launched at a pretty unremarkable 2550fps with a very modest BC of .125. It's shockingly easy to hit the little buggers out to 200yds and beyond. Now I find myself wondering how much more performance is on tap with this little bore and contemplating building or buying a centerfire .17. Anybody have any experience with the .17 Velociraptor, .17 Ackley Hornet or any .17 centerfire. I think something that keeps pills in the <3500fps range would give decent barrel life and perform like a laser out to 300yds. Maybe on a Howa 1500 mini action or a CZ527.