Hello all, I've been a longtime lurker about this topic for reloading 308 winchester cast loads for semi-autos. I've had good luck running powder coated 160 grain gas check, lee 312 casts on my AR-10, pushing them around 2000 fps, cycling, last round lockback, and with decent accuracy.
I also ran the same casts in my L1A1/FAL with great success with one caveat...the area where the gas port (gas port never gets blocked though) and the piston gunks up with fouling every 100 or so shots. This is at least workable, as I often service and scrub the gas piston assembly clean every range session, but I'd like to know if anyone has ever found themselves in a similar situation and have done any measures to prevent fouling when running casts in a L1A1 or any other similar piston driven semi-auto.