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What shphtr said
Posted by Ray on Jan 29 2006
What shphtr said is correct. Also, if you go to the Barnes site you can download and print a document titled "Triple Shock X-Bullet Loading Guidelines," which basically says to use the Barnes-X data for the same weight bullet as the 3-Shock you are using, and to start low. As you come up, do so at .5-grain increments as you watch for all of the excessive pressure signs. You may have to work 1 or 2 additional grains above listed loads to achieve equal pressures, but here is where you should be careful.
Some of the things they talk about in the document are as follows: Watch for signs of excessive pressures, because pressures can jump dramatically; work-up loads in 1/2-grain increments. Watch for excessive head expansion, sticky bolt lift, flattened primers or shiny spots on the base of the case. If you have case expansion of more than .0005" with a once-fired case, this is a sure sign of excessive pressure. You will have to measure the case head with a blade micrometer just in front of the extractor groove, or a regular micrometer and measure the belt on belted cases. If any of the excessive pressure sings show, back down one full grain and you will have a maximum load for your gun.
Keep in mind that not all blade micrometers are capable of measuring down to .0005", but most electronic (digital and more expensive) ones are. Also keep in mind that even a maximum load for your gun can be dangerous. For example, the load can be maximum and safe at the moment, but not the next. If the ammo temperature increases the next time you fire it, such as ammo left exposed to sunlight, it could develop excessive pressures that can easily surpass the previous maximum pressures.
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