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For a 300gr UCSP it calls out 29gr min. and 31gr max for H110.
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The Speer UCSP is the UniCore Soft Point and for all practical purposes is a copper plated cast bullet. That is why the charge weight is different than what you see with the Sierra copper jacketed bullet.
Look up the data on Hodgdon's site and you will see a totally different load range for the powder and bullet your using. The Sierra and Hornady XTP, while not made to exact tolerances are much closer than the UniCore is to what you need to go with.