I don't reload anymore, but the 357 Magnum was designed to get just a bit over 800 foot pounds with a 158 grain bullet out of a 6 inch barrel. It looks to me that you're loading to attain around 525 foot pounds at muzzle. Don't worry. You can't break a M28. Just stuff in some more powder until you hit 1500 FPS with a 158 grain bullet, and you will see the magnum effect.
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Dr. B
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