I've been trying to find a suitable heavy cast bullet for my 327, and I think I may have had some luck.
I knew from past experience that my Lee molds that are nominally .309" usually cast at about .312" to .313" using 2Sn6Sb92Pb (Hard Ball) alloy, so I ordered the Lee C309-113-F mold, and sure enough it casts right at .313". I used a Lee push through .314 sizer to seat Hornady 30 Caliber gas checks. Note that the gas checks are a tight fit on this bullet -- just letting you know in advance.
With tumble lube (LLA) and gas checks, the bullets weigh in at an average of just over 119 grains. I have loaded them to right around 1350 fps in my Blackhawk with Accurate #9 powder and CCI-500 primers with good accuracy and no leading.
I'm happy with the load I have, so I will probably stick with it, but I suspect that the bullet would handle considerably higher velocities (since I use the same alloy with gas checks in my rifles at much higher velocities...).
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