March 11th, 2007

Rimfire Run-out: Shocking Test Results

Too often we rely on luck and “voodoo” to pick the best rimfire ammo. Shooters resort to testing batch after batch of ammo in hopes of finding the “holy grail”. What we’ve learned, in testing a 17 Mach 2, is that some of the accuracy issues with rimfire ammo CAN be quantified, and the “mystery flyers” can be explained. Using a Nielson Brothers Concentricity Gauge, we tested lots of 17 Mach 2 ammo from Eley and CCI. Most of the rounds had run-out of .002″ or .003″. However, we found some rounds had run-out as high as .009″ (See video). That’s shocking. A cartridge with .009″ run-out is a guaranteed flyer that will kill your group. Interestingly, when cartridge run-out was .004″ or higher, you could clearly see the bullet tip was way off-axis–confirming the results of the gauge. Using the Nielson Gauge we could quickly sort bullets in .001″ increments. For match purposes, you should cull anything worse than .003″ run-out. By sorting for .0015″ run-out or less, we were able to reduce our average group size by 30%. More importantly, we eliminated most of the unexplained fliers that were landing well outside the main group. The Nielson Gauge works for both 17 Mach 2 and 22LR. And, with different inserts, you can measure 17 HMR and 22 magnum rounds.

Click to Watch Rimfire Run-out Test Movie (1 mb .wmv file):

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March 11th, 2007

Anschutz Actions–Just Call Mac

Are you a rimfire shooter looking for an Anschutz action (or barreled action) to use in an after-market benchrest, silhouette, or prone stock (such as the new Elesio AN-1)? You can spend weeks watching the auction boards, or you can save time and money by just giving Mac Tilton a call. Mac, owner of MTGuns.com, has hundreds of “previously owned” rimfire rifles in inventory, including scores of Anschutz models. Most have model 54 or 64 actions–he rarely gets the 2000-series barrel-block style actions. But you can certainly build a match-winning rifle from a Model 54. Mac also stocks many BSA Martini and Walther match rifles. For more info, call Mac at (805) 720-7720, from 9 am to 5 pm, Pacific Time.

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