Originally Posted by samnev
While I generally agrre with the statement you should not go lower than a 55 grain projo. The 52 grain SMK is a lot longer projo than the 55 grain projo and it doesn't get over spun in any of my 1:7 AR's and accuracy has been excellent in all my AR's from 1:7 twist thru 1:12 twist.
There's an exception to every rule. SMK is some good stuff. The issues below 55 grain revolve around cheaper thin jacketed rounds coming apart. Sierra Match King is the opposite of cheap thin jacketed rounds.
The overspin accuracy problems came into play at long distances though. Any .223/.556 that doesn't fly apart can usually shoot accurate up to about 100 yards.