Sorry Vince. If it's the vagaries of the DeLisle you're asking about, you need a Delisle expert! But just remember that while the base rim dia of the .45ACP is similar to the 7.62, it's SMALLER than the .303 - that the de-lisle action was designed for! So the smaller dia .45 case would need assistance in much the same way as the equally smaller dia 762 case does