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My first two cartridges I ever loaded were the 30-06 and the 270, around 50 years ago. I started out with Hodgdon's surplus 4831. Still use the same load today but now I use H4831 SC. I haven't dropped my charge one bit and velocities are very close to the same. Have newer rifles today. Guys, the ONLY reason the the newer manuals show a reduced load over the old ones are the lawyers out there are looking to sue someone. And there are always guys out there that are going to load beyond the maximum recommended in the manuals. When they blow grandpas old Springfield, they will sue the powder company. The older named powder don't change in their ballistics. each and every lot of a standard named powder is formulated to be exactly the same as the previous lot. Changing your brass and primors can change pressures more than useing a newer made can of 4831 or anything else.
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