In reply to jolaem:
Your bigger concern at building an anchor would probably be the snow quality...
Interestingly, from one 2009 German test of snow anchors, a deadman style buried axe anchor actually broke their test pulley or something at over 16kN in knife-hard* snow with just some slight bending of the shaft... No idea of the ice axe shaft they used apart from length (60cm), but failed at much lower loads in soft snow, IIRC 0.3-1kN and 4-8kN depending on the hardness).
(* - from the classic fingers/pencil/knife snow hardness test, which can be pretty imprecise though - please don't take the numbers as an indication that e.g. any 1F snow can hold 5kN every time!).
Although I would not hesitate to get a T-rated one as well, if you don't mind the slight weight penalty I think the Air Tech Evo was still mentioned as T last time I looked?
BTW, anybody knows where do the often quoted 280kg and 400kg numbers come from? The only quotes of the UIAA-152 in public access mention mostly 2.5kN or 3.5kN for a test aproximating buried deadman (weighted in the middle, supported by two equidistant slings) and 2.5kN or 4kN for a test aproximating boot axe belay?
Post edited at 19:56