JMHO,But you might just want to try several different brands,weights types to see what your rifle likes the best first off.Then look for the style of projectile that you want ,round nose, spirepoint,Ballistic tip.hollow point ,etc.As far as factory loads for Blackies,and Whitetail the ever so 'ol faithful remington corelokt are hard to beat and you can get them just about everywhere.for factory rounds the Hornady custom in a 168 boat tail spire point is a very good round.Federal premium loads always served me well also.I had a Brownie A-bolt that liked the cheaper winchester PXP rounds better than anything else so that's what I shot in it even though I roll my own.Trial and error is most likely the best way for you to find out.You might get lucky and hit the right one first ,But you never know .I don't hunt Blackies so most of what I said mainly pertains to whitetails.I would think that you would probally need a projectile that has good penetration and retains the most weight.You might want to ask Ridge Runner about this one he is about as slick as they come around here on bullets and long range hunting. Once again this is just my opinion and you probally want to wait on what the really knowledgeable guy's on here have to say.