Hunting with an SBR?

[BillMe45]

My 300 BLK hand loads are pretty flat shooting and hit hard up close.

Out of a 14.5" AAC barrel

19gr of Win 296
110gr Hornady SP (Have used Sierra HP's but they might fragment)

2275 fps chrono'd 1260 ft/lb at the muzzle

using Hornady ballistic calculator and a 25 yard zero it looks like this: 1.6" high at 100 yards to 1.9" low at 175 yards

Your Input Variables
Ballistic Coefficient 0.256 Velocity (ft/s) 2275 Weight (grains) 110
Maximum Range (yds) 500 Interval (yds) 25 Drag Function G1
Sight Height (inches) 1.5 Shooting Angle (degrees) 0 Zero Range (yds) 25
Wind Speed (mph) 0 Wind Angle (degrees) 90 Altitude (ft) 0
Pressure (hg) 29.53 Temperature (F) 59 Humidity (%) 0.78
Ballistics Results
RANGE(YARDS) VELOCITY(FPS) ENERGY(FT.-LB.) TRAJECTORY(IN)

Muzzle 2275 1264 -1.5
25 2195 1177 0
50 2117 1095 1
75 2041 1017 1.6
100 1966 944 1.6
125 1893 875 1.1
150 1822 811 -0.1
175 1753 750 -1.9
200 1685 694 -4.4
225 1620 641 -7.7

 

[Wiskey_33]

The 85 grain TSX is the only 6.8 round I've hunted with and don't see any reason to change for Georgia deer. Never recovered a round but by the looks of the damage…speed kills.

 

[BillMe45]

6.8 is stout, out of any barrel length. You can work the 300blk pretty hard though in a short barrel useing magnum pistol powders like 296 and H110, 4227 and a bullet around 150gr is a good load too

 

[TheSnail]

I do all my hunting/hiking/stalking with SBRs

Here is a 350 lb trophy boar I popped with my 6933 @70 yards.

100 yard zero with the 1X aimpoint. Hornady 223 75gr BTHP Superperformance out of the factory 11" barrel. So a SBR will do it no problem. Bullet stabilization via grain to barrel length and twist is key. I initially ran 53gr, but found the heavier stuff to be a butt ton more accurate out of a 223 sbr. I then started hunting with a 8" 223, and found an even bigger difference in terms of accuracy comparing 53gr to 75gr. I now just stick with 75-77grain for all of my 223 sbrs.

I'm not too familiar with 300BO, but I would imagine that the light loads are still heavier than the 223 75gr. So IMO, if the measly 75gr 223 was enough to knock down a boar that weighs 2x my weight, I would just suggest to pick a gr that is most accurate out of the 300BO, per your barrel length & twist.