I have a 20" Proof AR, rifle +1 gas, 8tw IIRC. I reloaded a batch of Hornady 80 gr ELD-VT using 30.7 gr of CFE223 (30.9 was Hornady max data) and obtained 2930 fps, suppressed. Accuracy was better than factory, but I need to get a stiffer forend at some point. They are my point & shoot...