If you like using bore diameter conicals, and being a .45cal rifle that's probably what I'd use, I'd look into the .45cal 285gr Hornady Great Plains HP conicals. They are all lead so they expand well. I've used them in .50cal and they hit like a freight train. They are also not too hard to load and I've had great accuracy with them in the past. A box of 20 only costs about $7 retail at Walmart last I checked, so trying them won't cost you a lot.
https://www.hornady.com/shop/?ps_session=b55f426125e2fc88dbb3f979daf63380&p age=shop%2Fbrowse&category_id=884508aa2c870cbe f2bdbf70a2869e97
Mike