I had a chance to put a few Rem 300 BLK rounds through my gun (12" 5R Rock barrel) and had a few thoughts:
1. The subsonic rounds were indeed subsonic - which is good.
2. The Remington rounds were appreciably louder than my hand loads (lil gun.)
3. The Remington rounds were not as accurate as my hand loads.
That said, a friend was breaking in his new Noveske 16" 300BLK rifle, and his gun liked the rounds more than mine (then again, he had a longer barrel and a higher power scope.) Likewise, he commented that the Remingtons were louder in his gun than were my hand loads.
And his 16" wouldn't cycle with the subsonics without a can - but functioned fine with a can.
All in all, the price of the Remington makes them a decent deal, but for quietest report and most accuracy, hand loads still win.
And, FYI: my hand loads are reloaded on Whisper dies and to Whisper specs. The 300BLKs I shot this weekend were the first BLK rounds through my 300BLK barrel. I'll stick with Whisper specs when quiet and accurate are needed.
But for $21/box...
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