I use the lee 185 gr. in my mosin exclusively, its a good bullet. For high velocity loads, that are needed for long range, try the same powders as for jacketed bullets, just less of course. My go to load is 34 gr. of vv n140 for around 2200 fps. Be aware that velocity drops off rapidly after 300 yards. If I was going to be shooting cast at long range often I would be using the heaviest bullet I could use. In my. 308 match rifle I use the Lee 200 gr. over the 150gr for 200 yards plus even though it doesn't group as good at 100.