Yes I reload 308 caliber subsonic ammo quite often but only use cast bullets. Our usual charges are Bullseye and unique in the 6g-7g range and try to shoot for about a thousand feet per second. I'm not sure what powder do you guys have over there though, but anything in the faster speed shot gun powders works fine. I had better luck with bullets heavier for the caliber in the 165 to 200 grain range. My Ruger Gunsite Scout 308 shot nothing but these loads. That particular gun shot nothing but the Lee Harris 7.62 x39 bullet sized .309 at 1100 feet per second into about two minutes of angle with a DOT sight. That particular load consisted of 7 grains of Hodgdon titegroup.
G A Damron V ,the vegatarian varmint destroyer.