There ya go. 5/8'' at 40 yards ain't bad, not the best rest, working up loads, can't remember if you scoped it or shot with open sights. Sounds like a shooter to me.
Did you see BNB's post, 2650 fps with 145 Silvertips, that's smokin', betcha that would light up a coyote. Hope he shoots some groups with that load, maybe it'll group.
Got yourself a 'hotrod' using light jacketed bullets and a 'tank' with heavier cast bullets. I can't wait to try some of my hard cast 158's. Love them pistol calibers in rifles. Two of my favorite rifles are .44 mags., deer don't know what hit 'em. I've been studying, especially since I read what JPH45 had to say about the .445 SM. I got a .45-70, got a .444, and yep I got a couple of .44 mags. But looks like soon there won't be any more .44 Handi's and most likely no more .44 barrels either. Maybe I should think twice before I rechamber my .44 mag. barrel. :? If I ever get it. May not be any more.