DA could be Dominion Arms of Canada, but that base looks quite a bit larger than .308, so 8x57 and 7x57 are out, and even 7.5 French, 7.5 Swiss, 7.7 Jap and 6.5x55 are not as big as the case looks.
If golfnutrlv doesn't have a micrometer or a caliper maybe he could find a gun shop that has one and get some accurate measurements.
Jim
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