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So long as you're referring to the newer AA-HS hull there's no difference at all that I've noticed. Nor was there any diffeence in the old AA compression-formed silver or red hull.

You'll find load data for Winchester hulls on any of these powder companies' load guide pages:

Hodgdon Shotshell Load Data

IMR Shotshell Load Data IMR, an acronym for Improved Military Rifle, is now owned by Hodgdon.

Alliant Shotshell Load Data (Formerly Hercules)

Winchester Load Guides in PDF Form (This company can't seem to get in step with the rest of the industry by offering online reloading data for its components, so you'll need Acrobat Reader after you download the PDF files.)
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