Thanks Ken - that certainly puts my theory to rest. I guess it's safe to say you tried them in the other end too....
By the way Ken, that's a very nice DH and in great condition too. I'll bet a previous owner was afraid to shoot the Damascus barrels. A lot of people were so afraid of Damascus that they replaced and junked the original barrels or scrapped the entire gun. You are very lucky to get that one. Congratulations on a great find!