I use a similar load to 6pts . 19 Red dot 16 G fibers inside SP10 wad. 1 1/8 oz shot. Fine target load for short 10. Have used 1 oz with thicker fibers.
When loading “off the Charts” short 10 or 16 G I make a spread sheet with various recommended loads. Comparing you will find a few that don’t make good sense. Individually not obvious sorted by powder brand and charge obviously wrong. Another check is short 10 “USUALY” able to handle 12 G published target loads.
William
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