Hi Vikram,
yes thanks I had a nice vacation.
Regarding your questions I try to answer them best as possible. The quality of their products is outstanding – but you pay for what you get. Hartmann & Weiss has their main location in Hamburg, they have a second location in Kiel as well. In Kiel it is more or less a toolmakers shop with heavy machines (e.g. spark erosion ) where they do the various actions types. In their Hamburg facility they do barrel manufacturing, stoking and hand fitting and minor parts.

Nothing wrong with your choice of calibre .30-06. It is for sure the best choice you can do under your circumstances. H&W can build you different rifles for this calibre. But I think that the single shots based on a Hagn or Heeren actions is not a good choice because you told you are limited to one rifle only.
On the bolt actions you have different choices. H&W have 3 different action sizes small, standard and Magnum. They build take down where you remove the barrel which is screwed into the action without tooling (again two choices: interrupted thread for quick removal, or full thread). They also build non detachable barrels bolt action rifle.
On a none detachable .30-06 you have a choice of either an intermediate action for a lightweight rifle or the regular action for a normal weight rifle. You have various options for scope mount square bridges and so on.
Because they have their own shooting range in their basement, a customer can test out his new rifle in a very convenient way.
I have actually two rifles and one under construction of them. The two I have are very accurate. The bolt action is a .416Rigby and it shoots 3 in 16mm at 100m. So I can send you pictures of my two rifles which is a bolt action and a Hagn single shot action by email. Please respond if this is ok for you because it mite block your emailsystem.

Their address is:
Hartmann & Weiss
Gunmakers,
Rahlstedter Bahnhofstrasse 47,
22134 Hamburg
Germany

Email: hartmannundweiss@t-online.de

Best regards
Robert

P.S the Hagn rifle in the link that iwantadouble shows is not a finished rifle from H&W – simply this is not their style of work;)