I have both, and am trying to decide what would be best to use before I start loading up hunting rounds.

My 300blk is a 9" AAC with an AAC Suppressor. It's very quiet and shorter than my 20" 5.56mm AR. It is heavier, however. Deep down, I want to use my 20" 5.56 but if 300BLK is a better round I certainly won't mind and the suppressor would be an added bonus.

I guess my questions can be posed as follows:

1) Is 300blk out of a 9" barrel more or less deadly for a deer than 5.56mm out of a 20" barrel?

2) Is 300blk a significant disadvantage at shots longer than 150 yards due to accelerated drop and loss of velocity?