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Lots of cracked slides these days caused by less than perfect metallurgy, hardness, fitting, etc.. compounded by high pressure 9major loads. My goal in developing a great load is to maximize performance while NOT destroying me or my gun. The common sense recommendation is to use a slower powder to reduce case pressure. OK, slower powders measured & ranked how? Powder manufacturers charts are considered 'guidelines' as to 'relative' burn rates, and should maybe be considered most accurate with their own product? Add to this, the different burn rate charts available have