Some time ago, I designed a .243 AI reamer for a friend. We both agreed that he would be using Lapua brass, because of the quality, and so we made the chamber length, to the end of the case neck, a bit shorter than standard, after measuring a number of Lapua cases, to reduce the gap at the end of the neck after fire forming. We also worked backward from the FL sizing die, non- bushing style) by sizing some well used AI brass from a friend's rifle, and set up the neck diameter of our reamer to get the neck tension that we wanted. To do this, it had to be a tight neck design. The other areas that we paid close attention to were the shoulder diameter, making it only a half thou. larger than the sized case, and the base diameter which we set at a thou. over sized case. At the end, we ended up with a good match between brass chamber and FL die that produced very straight brass, and excellent accuracy, without the cost of a custom die. Dave Kiff, who owns Pacific Precision, does not charge extra for custom dimensions. The rifle is built about a sleeved Remington short action, and is very accurate, being reserved for the longest of shots in the varmint fields. Our latest project has been a close neck, no turn .204 Ruger reamer. This time we used a bushing die so that he could use a larger neck diameter and not have to turn. We matched the body diameters in the same way.
