Al:

Yep. That's why we had such a hard time at TJ's with it. The bullets sometimes weren't making it to the target - they were coming apart in mid-air 20 to 50 yds downrange from the muzzle. Too much velocity and RPM's coupled with a slightly rough throat (gunsmiths guess) boogered up the thin jacket on the Sierra MatchKings enough that they wouldn't hold together. The Bergers have a thicker jacket.

FWIW, that Sierra Matchking bullet is spinning 279,600 rpm when it's leaving the muzzle..... (MV 3495 fps, 1:9 twist rate)

http://bulletin.accurateshooter.com/2008/06/calculating-bullet-rpm-spin-rates-and-stability/

To give you an idea where the elk was, take the distance from the shooting bench to the fence at TJ's. Now double that distance and add 1/3 more.

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