I shot a fox with a 190 30 cal BTSP close to 30 years ago with the same result. I've seen more damage and fragmentation - sometimes- with them over the past 20 years than I'd like. 375s in 270 SP or 300 RN all work. They are a cup and core bullet for Pete's sake. It's how this type of bullet works. Then again, 25+ years or <3 years ago, the 190 BTSP has also run itself through moose completely for me so what's not to like.
They're cup and cores; they expand, sometimes a bit much, but very rarely not at all. Know thy bullet. Just remember, if you can't kill it with a properly chosen modern bullet, most likely you wear some or most of the fault.
