Ya'll most likely will not agree or even like this but understand,it is said with all due respect.
I have been in the 300BLK game for some time now. A close friend and night hunting buddy has been it when it was the Whisper.
IMO . . . the BO is a fine hunting cartridge if used withing certain perameters. Stick with the light bullets. Stick with the most velocity possible. Use a well made,AND well thought out bullet for it's intended purpose. Use a target animal specific bullet.
To get the velocity needed,use as much barrel as possible. Always 16" if possible . . . but NOT <12.5". Velocity drops off pretty fast using pistol powders,and with very limited powder capacity vs bore size. My first two BO's were a bolt gun and a single shot. Both with 16' bbl's. I finally got a gas gun in the form of a Ruger Mini-14. It was used and extremely cheap. It shoots good,however I do not like even the slighest drop in velocity.
There are some fine bullets made for use on game in the BO. Number one is the 110gr Barnes TAC-TX. The Sierra 125gr Pro Hunter is another great bullet if driven fast. The 125gr NosBalTip is another. Give the Hornady bullets designed for the tube fed 30-30's a try. There is a 150 and a 135gr. Both with alot of exposed lead at the nose AND they are HP's.
No lead bullet should be used . . . especially hard lead. They just will not expand at the slower vels. Most "varmint" bullets designed for a 308Win,30-06,and other 308 bore guns will act as a big game bullet at BO vels.
There are tons of good bullets that can be used for big game hunting,when driven fast,out of a 300BLK. Don't go heavy and don't go slow. No need to and the animal deserves better.
The above are my reccomendations after some years and alot of expierance with the 300BLK. My hunting buddy has quite a bit more expierance using the BO on animals,especially deer. I know that he would agree with my above post. His "go to" hunting bullets are three that I listed above.
How you hunt,what you hunt,and your use of equipment is your choice. I respect that. --- SAWMAN