Our settings are now far more detailed than first envisaged. This is because:
1. Different brands of brass require different power levels. Now that all our settings are neck and shoulder anneal, this fact is much more apparent. Extensive metallurgy tests show that alloy composition is not the reason. Rather it is the mass of brass to be annealed. Brands such as Lapua and Norma are usually heavier in the neck and shoulder. There is significant variation between the requirements of each brand, so our settings are individualised for each one.
2. Depth of insertion into the air gap is critical. A variation of only a few millimetres can make a difference of 20 hV or more in the result. Therefore we supply depth specific pilot which do not need adjustment. Just thread them all the way in and they are ready to go. There is still some commonality. For example, the family .243 W, 7-08 R and 308 W all share the same pilot #11.
3. Neck turning does make a difference. As brass is removed, the mass in the air gap reduces, meaning that less power is required. We provide separate settings for standard brass and neck turnings of -0.001”, -0.002” and -0.003”. If requested, we will add settings for further turning reduction. It is important to enter the correct setting. Brass with say 0.003” turned off the neck will be very overheated if the standard setting is used. Our Standard settings now include the nominal neck wall thickness of each cartridge we calibrate. This is an average of six readings per case x 4 cases, using a Mitutoyo tube micrometer with a ball anvil.
Note: do not use Verniers to measure neck wall thickness. They may give a false thick dimension.