My main problem is keyholes (tumbling), about 1 out of 10.
The bullet alloy is clip-on WWs dropped from the 9mm Lyman mold #356637 and weight about 158 gr, .358 in diameter. I shoot these out of a CZ Shadow and CZ 75B Matt Stainless. Applied is a single THIN coat of Emerald Tool Blue via shake 'n bake, 400 degrees @ 20 minutes. Yes, they pass the hammer test. These then go easily through a .358 Lee sizing die. They are then powered by 2.8 or 3.0 of VV N320. The 3.0 grains is a bit snappy. 2.8 gr is what I used for this bullet with old fashioned lube using a Lyman .358 lube-sizer, and they easily make power factor with room to spare. I've shot 10's of thousands of these bullets before, and never had a single keyhole. Thoughts?
My second problem is I'm having difficulty chono'ing these. I'm using a CED M2 with sky-screens on. I was out today, and every single plain lead lubed bullet registers and gives a normal reading I'd expect for this load. The PC'd bullets on the other hand would either not register, or give some crazy high reading like 6433 fps. I tried shooting these 7 ft from the chrono to 17 feet and everything in between. Not ONE PC registered correctly. All plain lead registered correctly. I did 20 shot strings, dozens of them of each alternating! Is it because it doesn't like that beautiful shiny blue boolit? It's about the shade of a Dillon blue, perhaps a bit lighter. Conditions today were sunny blue sky. It's driving me nuts! Hahaha