10 mm PCC

Handy chart for barrel length vs velocity... link at the top of the chart to get muzzle energy chart.

http://www.ballisticsbytheinch.com/10mm.html

Thanks. That’s a good chart. But it confirms. There is little to no to negative advantage to a 16” barrel over a 12” barrel.

If I build a 10mm PCC it should be an AR pistol not a carbine.

Now, if the alphabet agencies would just decide what they’re doing about barrels, braces, and suppressors I could get on with planning a build.