Matt is the primary author and owner of The Everyday Marksman. This is in contrast to the original Powley constraints limiting us to more or less full loads using IMR powders. Learning Your Dead-Hold BDC Reticle Video. Measure the bolt diameter and divide it in half. You got a glimpse at some of that math in my discussion of barrel twist rates. The Bison Ballistics calculator is a modern ballistics calculator for sportsmen. All of that expanding pressure has to go somewhere, andthe bullet is the easiest thing to move at the moment. ), I really dig the graphs and graphics. Its not universal across the board. When you look back over the history of the AR-15, youll find that we didnt just end up with a 55gr .22 bullet fired through a 20 barrel. Start with the 6.5 Grendel Compared to the targets from 25, 50, 200, and 300 yards, you probably noticed that a 100-yard zero really isnt all that useful as a point-blank zero. Were talking significant amounts of pressure in the realm of 51,000 PSI in the case of .223 cartridges. This will be your barrel length. This information was pulled from Federal's website. // ]]> //
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