I have 10 640 grain 580 diameter bullets that I loaded a couple of today. With the same powder load they shot 6" closer to center than the 535's that I used last week. So I'm looking for some heavier 640ish grain bullets. I've found two molds at Buffalo Arms that cast a 640 grain .580" and a 645 grain .585" hollow base minie bullet. With my problem of no crimp with the .580" last week I'd like to try some of the .585's. Don't want to buy the mold until I know they work though. So I'm looking for some .585" bullets. Seem hard to find.