I've always installed gas checks on my coated casts using these checks and a lee sizer:
https://www.sagesoutdoors.com/30-7-62-mm-caliber-015-aluminum-gas-checks/
I sized and GC'ed all of them last night. I even tested out a new method where I installed the gas checks by hand before sizing. A good bit would 'snap' on while others would just cling on due do a bit of flashing on the heel. The ones that just cling on seem to crimp on just fine when pusher through the sizer. It's as if these gas checks are designed for this bullet with powdercoat applied.
Thx was curious/confirming.
I have been plopping on the GC before coating as John does (he is the one that recommended it) my coatings tend to go on thick and I don't knock as much PC off as I should. John told me how, i just don't do it Was wondering how easy it was with your thinner coat. One of the PC I evaluated in my PC source thread goes on thinner and I was thinking to PC up a small batch with that coating to see if If putting on GC after coating was easier.
To enforce what was said, the GC I found makes it more accurate. I feel the consistent base with a GC makes a difference vs what you get without it. Sometimes I notice the base becomes an imperfect shape either from mold or from the PC process. Putting a GC on it if consistant and straight aides accuracy. Early on when I was putting GC on AFTER the PC, It did not fit easily so I got crooked ones and ones that did not insert as much. CG before PC does sometimes have the GC fall off and I just toss and remelt those.
My pistol bullets are never gas checked of course and my 9mm and 45 PC cast bullets along with the formula I use now are more accurate than any FMJ or Copper washed bullet I've been able to tune.
Guzma, I'm going to bump my PC source thread so you can post some of your recent powders to it.