Because of popular demand we provide aluminum gas checks to fit plain base bullets that were not made with a gas check shank. We mainly make these from lithographic plate that is .008 to .012 thick depending on caliber. The initial requests came from the 10mm users over on Glock Talk, since then we have been expanding the calibers. These allow reloaders to push their wild cat 45's and hot 10mm's much faster with less barrel fouling. If you have a 45 mold without a gas check shank, you can use the .452 plain base gas check for .45 Colt, .454 or even .460 loads and get the benefit of a gas check.
Currently we offer 8mm, 9mm, 10mm, .309, .32, .375, .41, .44, .45 and .458 plain base gas checks. These are thin gas checks made to just cover the bullet base enough for a decent crimp. It's best to run these through the sizer base first. A good solid and even seat is critical, the plain base gas checks must be fully seated before sizing.
While testing the plain base gas check using a LEE push through sizer we found that some of the LEE sizing dies have a rough ring inside the mouth area. A simple smoothing of the mouth allows for much better results with the thin gas checks. One simple way to remove the rough area is to use a die grinder stone. Here in the US a cheap kit can be found at Walmart, near the air tools. They have a small kit with a cone shaped stone that can be used in a variable speed drill or a drill press. I takes very little effort to remove the rough rings. We haven't seen the rings in other dies so far, the issue is only with some of the LEE sizing dies we have used.
All prices are in USD.