I have both a 25-06 AI and 280Nosler AI , I started forming both with factory ammunition some of these cases are over 7 years old and going strong, the 280 Nosler AI does use some factory cases, after that cases have been formed using the 10Gr. of X700 topped off with cream of wheat .
to reduce the load below the book, sounds like a bad idea in many ways to me even to form a case