Benchmark works well in .223 Rem. It's a very small-grain extruded powder, but it flows through a measure nicely. AR Comp is good in .223 also, but it is long-grained extruded and will NOT flow through a measure well enough to suit me. I use a Chargemaster when loading it for that reason. W748 and H335 flow well and work fine. TAC and X-Terminator work well too.
Not a .308 loader, so I can't say firsthand how any of those choices cross over.
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