But hopefully I can find some good bits of data that will be useful to you. According to several knowledgeable folks, it should have already replaced the 5.56 and7.62 NATO rounds as the U.S. I wouldn’t argue with someone who has measured results different from my own. The increased caliber allows the Grendel to launch bullets weighing from 90 up to 129 grains with exemplary results. Your elevation, temperature and barometric pressure will vary from my testing conditions as well. I plan to run my tests through several barrels of each length, but whichever barrel you have might perform a little bit differently. Just as a quick note, none of this is meant to be definitive. Federal Gold Medal Berger 130 grain OTM.Occasionally, we will temporarily publish load data. Federal American Eagle 90 grain TNT JHP Hornady Manufacturing Company develops and publishes reloading data for the Handbook of Cartridge Reloading.Wolf Military Classic (Steel) 100 grain FMJ.The ammunition I’m using is listed below. The barrels I’m using are 16″, 18″, 20″ and 22″ Liberty barrels made by Satern in Iowa. I’m not sure if this has ever been done before, but I haven’t seen anything quite like it. Further, the AR15 places a COL limitation of 2.255 inches so you loose powder capacity with bullets shoved in the case. Measure velocities, calculate energy and trajectories and then post the results for you to reference. What I’ve decided to do is take the four most common lengths of 6.5 Grendel barrels and shoot through them the eight most common and readily available factory loads on the market to see how they perform.
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