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I had borrwered a .270 about 2 years ago and had a helluva time zeroing because the bullets were keyholing. Aftere consiberable expense and aggravation I discovered that ballistic tips on the bullets were too long for the chamber and when I switched to a win. failsafe HP (no tips) the rifle shot like it should.
Tumbling is not always caused by deformed bases but can be evident when there is any form of instability.
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