What I do, I find a jacketed bullet of same weight and start at the lower end of the loading data and go from there. Many hard cast bullets can be loaded up to around 1,200 FPS without a problem.
I load 40 S&W using Hodgdon Longshot and go fairly fast and have had no problems with hard cast but I like and use 175gr and 180gr bullets, flat point and SWC.
Always be careful of reloading data from the web!
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Have a nice day!
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