Greetings @STC,
Cast lead projectiles are a whole new rabbit warren, perhaps best left until later. Sub sonics have a pretty loopy trajectory so ranges will not be long. Looking at the two projectiles on line the 175 grain seems to be intended for the .30-30 and the 190 for the other .30 calibre rifles including the blackout. .308 rifles often have a 1 in 12" twist so I would be surprised if they did not work, only one way to find out though. Hodgdon's suggest some loads.
Regards Grandpamac.
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