IMO Bullseye is too fast a powder for loading mid-level .357 Magnum ammo. You really want a slower powder for that job if you want to keep the pressures down and make them pleasant to shoot. I suggest a slower powder, something like W231/HP-38, Green Dot, Unique or even better, HS-6. I load a lot of lead for my .357 Magnum using HS-6 when looking for a mid-level load.
Please do your own checking but 8.0gr HS-6 under a 125gr lead bullet makes a great .357 Magnum load IMO. Use that data at your own risk and don't blame anyone if things go wrong. (but it's not a hot load at all) For a 158gr LSWC bullet I charge 7.2gr HS-6. Use a Magnum primer if you have them, the results are better...
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