My biggest concern with that load is getting a bullet stuck in the bore. Alliant lists a max as 5.8 with a 124 Gold Dot which is a plated bullet:
1.12 4 CCI 500 Unique 5.8 1,180
The plating on the bulet will likely act like a jacketed bullet in terms of friction in the barrel.
The start load would be a 10% reduction. 4.3 is a 25% reduction. Lead bullets are much more forgiving and better for light loads.
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