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As a reference, I worked up the following load for BB 147gr RN:

COAL: 1.125

Powder: 4.1 gr CFE Pistol

Primer: CCI #500 SPP

Brass: WCC once-fired

Chrono Results

Hi Vel: 953
Low Vel: 929
Ave Vel: 942
Ext Spread: 24
Std Dev: 7
I worked up from 3.7 grains, maxed at 4.2 with no observable pressure issues. Went with the 4.1 load because it had the lowest Std Dev and Spread of all loads tested.

As always, be safe - YMMV!

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