Hi Have bought subsonic .223 from Belmont Wanganui in the past
they use a 55 grain projectile x 4.10 grain T/Boss they havent had any for a while now and seem to make it just now and then when not busy doing other rounds
Trail Boss is easy to reload with if you have any ,if using other fine powder just be aware of excess unused space in your .223 brass
Good Luck
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