Cast Lead Thread ?

[Tokoroa Cast Projectiles]

Red dot and 700X are nearly as bulky as Trail Boss, the problem is the .222 and .223 cases are too big for subsonic loads just about any amount of powder
will be supersonic,
my Lyman cast bullet manual has a 54gr bullet 4.3 grains of 700X at 1510 fps and 4.7 grains of Red dot at 1590 fps in a .222 they are start loads
the case needs to be at least 50% full of powder to be safe,
plain lead without GC can handle up to 1400 fps the barrel needs to be super clean any copper will rip lead from the bullet.