Hawk, maybe it's too hot in your gun.
And I'd suggest that maybe that 300g load should be closer to 21.3g W296 (but that's just a suggestion. There's plenty of 'smiths that can retune your 629.)
Recommend W296 for heavy 44/41/45LC loads, Universal Clays for medium loads, TiteGroup for Cowboy and light loads.
Of course, I've been wrong plenty...
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"all my ammo is mostly retired factory ammo"
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