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If you are going to shoot HIGH Power even just for fun you will need a heavy bullet and a fast twist to get to 600 and be consistent. Most of the guys use Hornady 75grn BTHP Match or Sierra BTHP Match bullets. Both are great bullets and work very well. I am using Hornady 75 and they out shoot me. My RRA really like them. If staying under 200 yards then you can use just about anything like the other fellow said. Even Wolf has worked fro me at 200.Just my 2 cents
Dave S. Capitol City RPC Maine