If I had to anchor bull on the spot I would use the high shoulder shot regardless if cartridge.
If I HAVE to anchor something 'cause a bad thing will happen if I doesn't, then I shoot it *in the head*, and if it's too far away, not a good enough rest, moving around too much, etc. to make that shot reliably, then
I don't pull the trigger.
Trigger control is knowing when not to, too.
Tom