Guys,last time I checked it says 55 grains or less for best accuracy.I only use factory loaded ammo,because I don't own a reloading press.Why would any factory ammo be unsafe in a handi that is marked .223 remington? The 55 grain ammo I was shooting was Remington UMC .223 remington ammo,not 5.56 NATO.What I was saying was,that the Winchester ammo seemed like it had a little more recoil than other .223 ammo I have fired.I have fired lots of .223 ammo,I have a military ammo can full of spent .223 cases.I have owned 4 rifles in .223.I have never fired any of the military ammo,so I don't see where someone would get the idea I was talking about military ammunition.I would never suggest anything to anyone that is unsafe,or do anything that would possibly put myself in danger.Have you ever had a case rupture in your face before?I most certanly have,and trust me it is no fun.It was a factory loaded .44 mag cartridge out marlin lever action rifle.Someday I will post pictures for the non believers. :?