Maybe im just missing something here. Headspace is either right or wrong, we're talking just a few thousandths of an inch difference between right and wrong, and I understand what the throat is. I guess I've just never seen a throat cut so short that a factory round would hit the lands or maybe I've just never really paid that much attn to it. I couldn't imagine shilen cutting a throat that short unless you specifically asked for it and if that was the case, you would already know the chamber specs. I'm just wondering if the smith is just being cautious or he already knows it has a very short throat