; You will find good penetration and expansion from the copper jacketed bullets at the vleocities you'll be getting.
: I expect with top loads, your 20" barrel will put the 175gr. out at 2,500fps - no flies on that one. Try Reloader 22, IMR 4831 and H4831. I had that data handy a while back, but since the move, it's disppeared.
: Probably a better heavy bullet is the 160gr. in premium bullets. You can add another 100fps to that one - for just over 2,600fps in the 20".