as per my other post ive been having problems with keeping checks on my 300 bo bullets at top end loads. I usually install checks size to crimp them tumble them in pc and back then size again. I got thinking that because im dealing with two different metals if its possible when heated up the check looses some of its grip and doesn't shrink back as much as the lead does. Someone suggest my alloy (about 22bhn) is to hard and maybe the gas checks cant bite into it. Like I said the check seem to go on nice and snug and there sure not loose on the shanks. Any thoughts? I had to make a hard decision yesterday and melted down about a 1000 of them I had done that were giving me this problem that I hadn't loaded yet and have about a 1000 rounds of ammo im probably going to pull down because they have those bullets in them. . As you know that's a lot of work and gas check down the drain but it does me no good to have bullets that don't work right. I guess I could shoot them up and just clean the barrel every day but those 1000 rounds were put away for just in case and I want them right. Even all nicely stacked in an ammo can on loading strips.