Just received a NOE 311-121-RN 4 cavity mold from NOE. I will be casting the first batch today. I plan on sizing some to 308 and some to 309 and the powder coat this test batch for the M1 Carbines. I also will PC some unsized for the SKS. Will be loading some tomorrow for this weekends shoot. I can't shoot yet but I do have a friend and a son who are willing volunteers.
You may consider slugging your bore and finding out your exact bore size. Then size your cast bullets to fit. We ran .310 and even .311 diameter old automotive wheel weight lead bullets in High School. But ... this was in 1965. Yikes!
Let us know how your cast bullets shoot and print. We did not run gas checks. Considered way too expensive back in the day. Is your production pot 220 or 110? Reason I am asking is what you are doing is what I want to be doing. Fun!
I have slugged both the Inland and the Rockola. The Inland has a new barrel. But the reason I sized down more than necessary is because of adding the PC. I've been shooting Bayou Bullets which are sized to .309 and they worked well in both guns. I think these carbines will do better if larger. Will be finding out tomorrow which color shoots better.
I have to Lee Pro 20 and my friend runs a Lee 10 lbs pot. For the run we did we ran mostly mix WW and scrap lead I had collected. Not to concerned about the BHN because of the PC. Certainly none of the stuff in the pots was more than 16 BHN. A lot of folks dislike the Lee pots but I've been using mine for 15 years and it's still working well. It does require cleaning once in a while. I also have a PID controller on mine. Which is convenient but not as important as it used to be because I now PC every thing but the 9x18 Mak for my Bulgarian Mak. Don't mess with that perfect fit combination.
How are you doing your powder coating? I do commercial quantities of lead jig heads with powder and use a dedicated air bed cup for the coating process (provides a pretty even coating without any more than is needed. All of my heads are subsequently baked for 20 minutes at 350 degrees to harden the coating a bit...