Polygonal rifling in rifles.

I have one of those Black Hole AR's with polygonal rifling and up to this point, I'm NOT impressed with it. Maybe just haven't found the right bullet or just haven't given it enough time. Right now, it's been collecting dust because an el-cheapo DelTon gives better accuracy.
I fell for the advertising of less fouling and higher velocities.
 
BLE, I can't be sure if that is trough shaped rifling or not, what with the slaunchways photo angle.
Click to expand...

The lands have sharp edges but the bottoms of the grooves are kind of round. This is the barrel of a muzzleloader I own, I'm not sure who made the barrel. I guess the idea was to make the fouling easier to clean out of the barrel, no 90 degree corners for fouling to hide in.
 
Steyr Mannlicher has polygonal rifling, iirc, and it shoots pretty well in my experience.
 
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