To Case Prep, Or Not To Case Prep

Sierra Bullets

Written by Sierra Bullets Ballistic Technician Gary Prisendorf


Around a year ago I bought a Ruger American Predator rifle chambered in .223 Remington, with the goal of turning it into a coyote extermination machine.

While working up a load for it, I went through all my typical brass prep steps, weighing cases, annealing case necks, uniforming primer pockets and deburring flash holes.

I started wondering just how much difference all my brass prep would really matter for a factory rifle at normal hunting ranges.  So I decided to do a little experiment and load up 15 rounds using fully prepped cases and 15 rounds with very minimal brass prep and compare the group sizes at 100 yards.

I weighed out cases until I had 15 within half of a grain of each other, annealed the case necks, uniformed the primer pockets, deburred the flash holes, full length resized, trimmed them…

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