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The reference to "8mm" is to the fact that at least one single heat treated M1903 blew up when an 8mm Mauser round was fired in it. At least that is what the investigation reported. It is not possible to chamber 8mm in most .30-'06 chambers but I suppose an oversize chamber, combined with an undersize round might allow it. Pressure would, of course be fairly high, and I assume the case let go, wrecking the rifle.
But most of the blown '03's failed while firing .30 ammunition, though some of that also was defective. There have been two post-WWII reports of SHT rifles blowing with target loads of a lead bullet and 9-10 grains of Bullseye. The rapid burn rate of the Bullseye created a sharp shock that was too much for the brittle steel of the receiver.
Jim
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