I'm sorry guys, but the last several posts have not shown up on my screen, till now.
About the Handloader artical, or any other, which showed accuracy to be better with factory checks. - I'm convinced the problem is with the standard practice of stacking thin checks to get some grip on checks shanks cut for factory checks. Poor accuracy is certain. Either material of proper thickness must be used or the mold must have the check shank opened up to provide a perfect fit for the thin checks. If thin aluminum checks are a tight fit accuracy will be excellent at speeds very close to what factory checks will deliver from rifles, and probably at full power in magnum revolvers and anything with less intense pressures and velocity. This factor is one of the main concerns I have, should I start producing gas check tooling. I'd have to take on the modification of customer molds if the project was to fly. (Make a profit.) Yet, many customers would want to make checks of a huge assortment of available material, which would mandate special check making tooling for each type of material, plus special sizes for check shank opening. (Custom reamers, several for each caliber.) The only way I see so far to make it work and not go crazy with all the variables is to make tooling for use with the large beer cans only. One can find them easily even if he doesn't drink out of them. (If he does drink out of them very much he may forget what he is walking along the highway looking for! See below.)
I think it very thoughtfull of Friskies to paint the inside of their aluminum cat food cans, as cats with Alzheimers wouldn't make good pets. - But why on earth do the beverage producers all leave the inside of their cans bare, for human consumption, with the aluminum which leaches into the drink a known and proven cause of Alzheimers!!!!!!?
? The last time I drank out of an aluminum can was about 7 years ago, a 'friendship' can of pop that I took so as not to offend the giver. The aluminum taste was sickening to me, because I wasn't used to it. It will forever remain my last beverage, or food, from an aluminum can.