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Wilson machines the rib on Lancer mags to clear the ogive. He sells them for his rounds. IIRC he doesn't recommend using any other.
As the 6.8 community learned long ago, mags are cartridge dependent and changing just one dimension can make them a nogo. With .300BO, it gets by.
As for a .300BO gun being able to shoot any round, supersonic or not, suppressed or not, without an adjustable gas block, well, it's luck of the draw. It's known that tuning the AR for low pressure cycling results in much harsher action at full power. A .300BO gun running subsonic unsuppressed well may not be what is best when shooting supersonic suppressed.
That may not have been the intended thought but blanket statements allow others to draw a generalization like that. And reloading to fit each circumstance allows that sort of thing, when in practice the budget shooter handling off the shelf rounds may have issues.
Those supersonic unsuppressed rounds are also going to follow the ballistic curve of most bullets with larger frontal areas. They all suffer from reduced range and higher amounts of bullet drop. That alone makes the .300BO an intermediate to close range cartridge, whereas others are quite well known to reach out 200m further just as effectively.
It's a matter of tradeoffs, and exactly why the .300 x 5.56 never made it as a viable 3Gun cartridge in the 80s when it first came out. Expensive and short ranged.
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