I've hunted with an 1894 and a Super Blackhawk and had luck with run of the mill Remington 240 gr SJHP and Winchester 240 gr JSP. I've never tried an all copper load but I've wanted to try Buffalo Bore 225 gr Barnes XPB. Expensive but BB is good stuff.

https://www.buffalobore.com/index.php?l=product_detail&p=315