I initially bought some hornady factory subsonic 300 whisper ammo loaded with 208 amax. I got a good deal on the stuff, and to my surprise it is very accurate. I am almost done with all the factory ammo, and i will be reloading the brass. I would try to copy the factory stuff, but it burns extremly dirty. 20-30 shots will leave the barrel filthy and groups get nasty (some unburned powder and tons of carbon). Is anyone else having similar issues? If not, what is burning clean for you? I will continue using 208 amax bullets.
FYI, I have disected one of the factory rounds. It is a very fine spherical powder. I think it was around 10-11gr.
16.5" 1:8 bolt rifle