2 coats of PC better for higher pressures?
I am stumbling along with my Glock 20. I have tried ACME .401,180 grain, HiTec coated boolits with zero leading. I believe the ACME boolits are Pune 16.9 BH according to their website. The load I used was 5.8 grains and 6 grains of green dot. I bought a group buy .402 170 mold a few weeks back. I slugged my barrel and the largest spot was .401. Most spots measured.400 to .4005. I honed out my lee sizing die to .402. I tried a 7.5BH alloy PCd and leaded. I figured the alloy was way to soft so I tried three more alloys in hardness of 11BH, 12.5 BH, and 15.4 BH. After seating and crimping a dummy round to measure. It wad still .402”. My load was 7 grains of unique. The 11BH. And 15.4BH boolits definitely leaded the front of my barrel. The 12.5 BH I couldn’t tell for sure but might have. I cleaned the barrel after each 15 round alloy testing. I did do a PC smash test and the PC stayed on. I baked my PC at 445 degrees for 26 min. Approx after 4 to 5 min the PC starts to turn shiny and then 20/21 min for the bake. From what I’ve read if leading is only towards the muzzle end the “lube” has worn off. Wondering if I should put a 2nd coat of PC on my boolits, size again, and re try my test? I also will be going back to 5.8 grains and 6 grains of green dot since I have 8 pounds of powder. I would assume green dot loads I’m using will generate less pressure than the Unique 7 grain load I was getting leading with. I had some lead speckles on my muzzle crown. Almost guessing the “flash” was burning the back of my boolit bases.
I’m wondering if a double coat of PC will make my boolits more resistant to leading? I am shooting the factory barrel and wondering if I should order up a wolf barrel with regular rifling for cast?