I shoot a 50 Knight Bighorn
295 Barnes TMZ with 110 gr T7 fff
I do use the RWS musket caps, but am told the RWS #11 work great also (I have both, as sometimes I can't find one or the other)
Beautiful expansion on my elk last year. 1 shot, DRT

I also shot the SST 300 gr. Was VERY accurate at 200 yards, 110 gr T7 FF. Didn't like the stories of expansion issues, so I changed to the Barnes.