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There definitely seems to be a problem with Sako/Tikka rifles, or at least those with fluted barrels. The problem of a split barrel can happen with other rifles, though. A couple of years ago, a Springfield Armory, Inc., M1A went to pieces when a "no name" barrel split in half lengthwise. IIRC, analysis indicated an occlusion in the barrel metal. Once the barrel split, the two pieces of barrel acted like pry bars to pull the receiver ring apart, and the rest followed as you would expect. In that case, as in other similar cases, the cartridge case was split also, with the bottom half remaining in the bottom of the chamber, almost like a demonstration cutaway. The bolt was intact and neither the bolt nor the case showed any sign of excess chamber pressure.
Jim
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