There would never be a need for a magnum primer with Bullseye.
Using .38 Special data in .357 brass would give somewhat lower velocity because of the greater volume... unless you seated the bullets .135" deeper, which would not likely be an option with 125s.
Do be careful, the only gun ever demolished on our range was a .357 loaded with Bullseye at the high end. A double charge will fit and will blow it up.
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