Originally Posted by
Pappabear
There are no advantages to 300Blk over 5.56 in your scenario. I only see 300BLK useful in CQB subsonic suppressed for killing folks indoors very quietly. Which I would choose my MP5 or MPX 9mm subsonic suprresed for that mission. YMMV
PB
Did you watch the video? He compares 10.5 barrel performance with 110 Blk against Mk 262, BLK 2,200 fps ME 1,185 and 5.56 2,400 FPS ME around 970 with a 30 cal bullet 33 grains heavier. If shooting at 600 I would rather be using 5.56 with a longer barrel, but 300 and in with a 10.5 and a good bullet 300 is a winner IMO.
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