I've always wondered why European gunmakers have so many proofmarks and so few caliber designations on their guns.
You might find something matching in these cartridge lists.
http://www.megapathdsl.net/~dvivas/alex-dwm.htmlhttp://www.ammunitionpages.com/download/408/German%20and%20Austrian%20headstamp%20codes.pdfThe markings on your rifle might be identified by someone here.
http://www.ecra.info/start.phpBruce