PC works great for 44/45 cal boolits because they stand up easily. When you start getting down to smaller diameter and longer, it gets to be a challenge to keep them standing up. My silicone pad needs to be perfectly flat to PC 6.5 mm and as I said earlier in this thread, my silicone pad hasn’t stayed perfectly flat. I have tried silicone ice cube trays and hot plate mats. No joy. However, the silicone pads I have work great for my .45/70 boolits. For the 6.5mm I’ve chosen to tumble lube in Lee Alox. Just easier for me.