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I have experimented and settled on two others loads for my 10.5" AR barrel since the post quoted above:
8.1 Grains of VV N110 powder
10.0 Grains or AA1680 powder
Both of these are subsonic in my barrel with 220 Grain Matchkings and I have since shortened the OAL to 2.09+/- due to feeding issues with certain magazines.
Accuracy is better out of mine with the Vihtavuori N110 powder so with $.40 bullets, I will load with the more expensive powder.
My next project will be to get a consistent subsonic load with 175 Grain Matchkings (the 2400 varied with the external temperature and some would crack on me). I picked up 500 of them from polygunbag cheap... Will try out 1680 to see what I get.
Maybe this weekend I will chrony some loads to figure out what is working best in my barrel.
My recommendation is to use the Sierra manual and work down to subsonic from the loads they list. My barrel tends to be much faster than the TC barrel they used and I have had to adjust my loads way down to where they may squib in other people's barrels. So, load five and test them out and then drop the charge if they are cracking. If in doubt, check to see if the barrel is clear rather than just firing another round. 30 seconds to check can save you the cost of a new barrel!
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