![]() Don’t get me wrong, 5.56 NATO is a great cartridge and it covers a lot of ground. 223/5.56 NATO cartridges were invented, people have been trying to replace them. With so much in common, it’s no wonder that you may not be sure what is right for you.įrom the history of the cartridge to the ballistics, we’ve got all the information that you need!Įver since the. 6.8 SPC Head to Head: Which is Better?Ħ.8 SPC and 6.5 Grendel have been rivals since they hit the market. Where applicable, in the Brand of Brass column, the parent cartridge is identified as "ex-" as in "formerly” or "was once”.6.5 Grendel vs. Note: The Standard program tables below feature many wildcats and cases formed from different parent cartridges. In that instance we need samples to determine the correct value of the AZTEC pilot code. The only time AZTEC users need to send samples is if a cartridge is not listed in our AZTEC pilot codes table (see other drop down under "Settings and Pilots" tab). Mark l model customers without AZTEC are welcome to send us samples for calibration. The program settings below are based on the median of each set of sample cases supplied by customers. We recommend this for the most consistent annealing results. Many competitive shooters sort their cases by weight, and use the median cases for competition. For the precision reloader, it can be a factor in achieving the best possible consistency. ![]() For hunting ammunition the difference is negligible. Always AZTEC analyse a new lot # to check for variations.Ĭase weight variation: For any given cartridge/brand, the consistency of the annealed hardness case to case can be affected by variable case weight, in particular if the weight variation occurs in the shoulder region. For more information on why these variations occur see here. When this occurs, we note the difference on our Settings page. For example, we have tested two different lots of Norma 308 brass which needed quite different power levels. Lot to lot variation: In general we have found excellent consistency. Please read our article on measuring neck thickness here. Note: do not use Verniers to measure neck wall thickness. Again, AZTEC automatically compensates for different neck turning dimensions. This is an average of six readings per case x 4 cases, using a Mitutoyo tube micrometer with a ball anvil. Our Standard settings now include the nominal neck wall thickness of each cartridge we calibrate. Brass with say 0.003” turned off the neck will be very overheated if the standard setting is used. It is important to enter the correct setting. We provide separate settings for standard brass and neck turnings of -0.001”, -0.002” and -0.003”. As brass is removed, the mass in the air gap reduces, meaning that less power is required. ![]() 243 W, 7-08 R and 308 W all share the same pilot #11.ģ. Just thread them all the way in and they are ready to go. Therefore we supply depth specific pilot which do not need adjustment. A variation of only a few millimeters can make a difference of 20 HV (Hardness Vickers) or more in the result. Depth of insertion into the air gap is critical. AZTEC automatically compensates for these differences.Ģ. There is significant variation between the requirements of each brand, so our settings are individualized for each one. Brands such as Lapua and Norma are usually heavier in the neck and shoulder. Rather it is the mass of brass to be annealed. Extensive metallurgy tests show that alloy composition is not the reason. Now that all our settings are neck and shoulder anneal, this fact became much more apparent. ![]() ![]() Different brands of brass require different power levels. Our settings are now far more detailed than first envisaged when we first started in 2015. ![]()
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