UB - I currently am running H335. This powder is known to be temperature sensitive but, it works well for me. My 17 is very accurate and my most fun cartridge to shoot. I even have a XP 100 pistol chambered in same. I have been having great success with the 20 grain Hornady Vmaxs and I am even running them hot. Many reloaders like to slow them down to even do better on fur but, for me its not a problem. This caliber shoots like a laser which makes range estimating at night not as crucial. I have had nothing but, a positive response with this caliber and on the few times that it failed I blame me more than anything for shooting to far beyond the cartridges capabilities on coyotes/bobcats etc. When I do my job behind the trigger, stay off heavy boned areas, fringes of the animal and angled shots it does typically what you see above in the picture. The double I shot above was not at extended ranges either where energy/velocity is shed. The top fox was at 33 paces and the bottom fox was at 21 paces. Keep me posted on your findings which I hope are as positive for you as it has been for me.