barrel length?

by rob , Thursday, July 02, 2015, 21:45 (3436 days ago) @ bj

It's a 16" Carbine. The CFE223 is a modern powder designed for AR use. Going by Hodgdons own data for this powder and exact bullet. I'm not surprised to see pressure signs...why I always work up carefully. But the gun has never had an issue except this one time and the second time out with this load. I really think the nickel brass last week compensated for the pressure. The extractor is extremely tight, no issues there. I'm just gonna stick with 27 grains...it was the most accurate of the two loads both weeks and I'm not a velocity chaser at all. I do have a chronograph and I have clocked my other AR load with H335 and IIRC it's somewhere around 2700 FPS but I'd have to double check. I usually work up a safe accurate load, confirm the most accurate powder charge and the chrono it. However, 27.4 grains may be a mild velocity by that standard alone but in my gun with a short gas 16" barrel might just be a bit much whereas an 18" mid length gun would handle it just fine...which, incidentally, is what I'm gonna build to match my lower when I get around to it and put this upper back on its original lower.