H414 and 760 are the same base powder but there can be large variances between lot to lot product. If you're close to max loads, start over on working up your loads. If not close to max, I'd load a couple of rounds at 5% below your current load and try them. Look for any signs of pressure and resume with the normal loads but expect to have to adjust the amount of powder. i might also suggest if you're having great success with it, buy all you can find. It's going away.
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