I have load data going back to at least the late 20's . A lot of it is still valid and the rest is for powders that haven't been on the market for over 50 years . Coincidentally that is almost how long I have been loading . Use your old data by doing as you mentioned above and you should have no problems , start low and work up slowly if you feel the need .
Eddie
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Grumpy Old Man With a Gun
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