Did some testing with my 458 Socom saturday.
loaded up 20 rounds of each. No gas check, gas check after first Powder coat then 2 more coats, and gas check after all coats.
The no gas check group wasn't. Only 4 of the first 10 actually hit paper. So I stopped wasting components.
The Gas check after everything had about a 6" group at 50 yards. Not great.
The Gas check in between PC grouped 15 shots into the same large hole and 5 flyers to the right.
Looks like I know how I will be making my bullets from now on.