you could try one of Dan Newberry's OCW Loads using Win 748
.223 Remington, using W748 powder:
40 grain bullet, 28.0 grains
50 grain bullet, 27.1 grains.
55 grain bullet, 26.6 grains
(a good milder load is 26.0 grains of W748 with a 55 grain bullets)
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