Update:
Tried out loads from 40gn to 43 grains of Win760 with the projectiles set back a smidgen more to solve the sticking issue.
40gn giving 2950fps, 41gn giving 2995fps,42gn is giving almost exactly 3100fps, 43gn is 3100fps.
No signs of pressure on any cases.
I will be settling on the 42gn load.
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