Looking at that ITX10-2 test load again and the space taken up by different shot types.
600 gr (1-3/8 oz) of ITX10-2 is the same volume as
636 gr of Bismuth #5 and
765 gr (1-3/4 oz) of Lead #5
If I was going to send in a new lead load to test, I'd probably try something around 26-28 gr. of Longshot under your 1-1/2 or 1-5/8 oz payload.
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