I had a chance to take two deer this year with the .300 BO.
Rifle specs:
Stag sbr lower - BCM lower parts with ALG QMS trigger. No reason for the parts other than known quality, this is the only lower I've put together.
Aero 8" upper - All Aero upper and bolt, BCM charging handle, AAC 51T Flash Hider
Optic - DNZ one piece mount and Weaver V-3 (thanks to Lost River mentioning in another thread)
Ammunition - Barnes 110 Tac TX
Suppressor - AAC SDN 762
Deer # 1 - Small (70lb) doe. Running shot broadside at about 45 yards in a field. 1 bullet to deer dropped it. Pass through but good damage during pass through and upon exit. This was unsuppressed and a buddy who was within 75 yards said it sounded like a shotgun or pistol. Scope set on 3x.
Deer # 2 - Large Medium antlerless buck (120lb). Facing shot at 65 yards in a brushy cutover. Bullet entered chest on the left side, knicked right side of heart, wrecked right lung, knicked liver and lodged 4" into the right hindquarter. Viewing the entry of the chest from the inside of the deer was impressive, looked like one of my broadheads had made it. ETA - Recovered bullet weight 100.3 grains. Measurement across two petal side .639", one petal side .448"
I haven't weighed or measured bullet, it only lost one of 4 petals. This was with the SDN 762 on the gun. Closest friend was 350 yards or so away and did not hear the shot. Scope set on 3x.
My thoughts -
I really like the handiness of this rifle on/in the stand and would be comfortable taking a shot on deer out to 100 yards. Looking forward to coyote hunting with it in the next few months. My 8yo also really enjoys shooting it. The collapsible stock and low power variable make this kid friendly.
Pics of the antlerless buck and bullet.