I too have a cased Holland & Holland Mannlicher-Schoenauer takedown, this one on a 1903 action and chambered in 400/375 H&H the first of the belted rounds. It is my understanding that the early H&H bolt action takedowns were MS based until the company switched over to the Mauser 98 actions just before WWI. The H&H MS takedowns are not that common and I treasure mine. Dave