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I have been trying to work up a load like that. Care to share your recipe? Also, Lead or Jacketed?My setup is using AGP 20% extra power magazine springs and a 24lb recoil spring. I've run 250 grain bullets 1300-1400 fps and they cycle reliably. An effective compensator helps slow the slide down, which is a must at these levels. A Carver 4 port serves that function for me.