I have been toying with the idea of casting bullets lately and had some questions about gas checks. I see that you can apply the gas check while sizing, and they crimp on. What if I want to use the Lee mold and tumble lube? Is there a way to crimp the check on there without a sizer? Are gas checks universal for caliber? In other words are they standardized, and will different brands interchange? I see the Lee molds come with and without the need for a gas check, but I prefer them in hotter loads, so what do I do to get the gas check seated on those?