consider 357mag/38 special & 44mag/44 special . . . use the magnum cartridge or the Specials which are already going at subsonic speed
1-10 twist .308 barrels will work up to 200grns with subs
go for the cartridge that throws the widest and heaviest bullet, consider expansion a luxury that your probably not going to get all the time, plan on not getting it . . . my 2c
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