Michael -
As far as retailing the 1893 sporters in the U.S.A., it is at least possible that Hans Tauscher could have brought some in. I've not uncovered any info at all to suggest that he did so. Tauscher first surfaces as a possible DWM agent in 1897 demonstrating the 1893 Borchardt pistol to the US Army. He was most noted for later promoting the acceptance and sale of the Luger pistol for trial purposes to the Army.
The DWM cartel was established on November 7, 1896 through a merger of Ludwig Lowe and three other firms. Tauscher certainly seems to have gotten in on the ground floor of marketing efforts, at least in the USA.
Since the Gew.98 entered German Service April 5, 1898, most of the action design features were already determined even as the 1893/95 contract rifles were still being manufactured. As Oberndorf sporters were being offered as early as 1903 (and probably sooner), it is hard to imagine DWM not also getting on the '98 action bandwagon as soon as possible.
So, my conclusion is that these DWM 93/95 sporters were offered for only a short period of time. They may have been just a "cleanup" effort to utilize excess parts on hand (again, conjecture).
http://forums.gunboards.com/showthread.php?191106-Whats-the-story-of-the-mauser-manufacturers http://www.landofborchardt.com/tauscher-article.html