Has anybody ever killed Bigg(er) animals like a hog, or deer size with a sub sonic rifle round? What cartridges would best fit this situation? And finaly, in regards to the repot of the gun and sub sonic noise. Once your round reaches the speed of sound you get noise. So, will a round breaking the barrier by 50 fps be any more quiet than one cruising 1000 fps faster? In my mind I'm thinking something like a bolt action .308?