With just the flattened primers and no other signs, I wouldn't consider the load unsafe. I use W296 in 357 and 44 mag. I know none of the loads are over max pressure based on case extraction, velocity, charge amount, etc, yet the primers flatten out pretty good. They are high pressure certainly, but not over pressure. I have seen similar flattening from hot loads using other powders, from factory ammo, etc.
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