As far as hunting bullets go, depending on just what your hunting, it's hard to beat either the Speer Gold Dot line or the Hornady XTP line for jacketed. However, your probably not going to find them in nickle plated from any company.
If you want to go with cast, they would match a lot closer to your nickle cases and there are plenty of good ones there. Choose weights ranging from 255 up through about 300grs. For one about in the middle, that would cover a ton of hunting look into the 45 270 SAA. There is plenty of load data on that one and it is an accurate bullet from the 45 Colt that will drive just about lengthwise through a white tail or probably even a mule deer depending on the alloy.
For most of my loads I use between a 260 and 280gr bullet. This gives me plenty of weight for penetration and I don't have to run them hard to get there. Using something with a wide flat nose is preferred by most as well, but the SWC design will get the job done as well.
For load info on the 45 270 SAA do a net search and you will find a PDF showing three tiers of load data. With your revolver you should stick to nothing higher than the second tier loads.