125gr SST over a book max load of W296 from a 16” barrel. The deer was 70 yards away and stepped forward just as I fired. Hit front left leg passed thru and entered chest leaving a entry hole big enough to stick two fingers in. It didn’t exit though I never did find it. Top of heart and both lungs were junked. He was kicking, trying to get up so I shot him in the neck and that bullet passed thru ending the festivities.
The guys over at the .300 Blackout forum like the SSTs and they are extremely accurate.