I happen to require some assistance with the use of a steel lathe. The work required would be to mill a few thousandths or a hundreth of the diameter off the entire length on an RCBS large shot drop tube. The shot drop is for loading 20 gauge #5 and larger shot. I had to smooth the other one I have for 12 gauge out with some emery cloth and then some 0000 steel wool. If you can do this and would like to help, please PM me. Thank you.
Here is a link to what I am talking about:
https://www.ballisticproducts.com/RC...tinfo/6008902/
Yes, it says for 12 gauge only, however, I also load #4 shot in my 20 gauge and the original shot tube doesn't drop shot correctly and it is a PITA to clear out!!!