I have a BAR Safari with BOSS in 300 WSM. I have both ported BOSS and the solid BOSS. Shooting that thing with the ported BOSS without ear protection will definitely ruin your day. I leave the solid one on especially when hunting.
It shoots great.
I bought a 300 WSM Browning ShortTrac a few years ago, but I could never get the accuracy I was hoping for, traded it .