This does not do what is says. showed my ammo was fine but it was not. - Lyman MSR Ammo Checker Block

I am not sure if this just has sloppy manufacturing, but I test every single 6.5 Grendel round that I make. They all passed this block test seating perfectly each time. Many of them failed to load in my AR platform 6.5 Grendel because my sizing die was not properly seated throwing the cartridge shoulders out of spec. The finished cartridges would not seat in the chamber and required firearm disassembly to remove the (live) stuck rounds. I checked many things before suspecting the cartridges were out of spec. This block did not pick it up at all. Very disappointed this has really no value at all except maybe as a paper-weight.