Last night I was looking at the auction sites researching my next rifle and ran across one of these which sorta peaked my interest. You don't see many Sig Sauer rifles in these parts, in fact I've only seen 2 and both of them were 202s, but man, they sure were slick rifles. The one I played with had NICE deep blueing and a bolt as smooth a butter! Based on that limited experience I know next to nothing about Colt Sauer rifles and a couple of google searches didn't turn up much either but I'm still interested and hope someone can help me with a few questions?
1 Does the Colt Sauer 90 have a 60 degree bolt?
2 A tang safety?
3 In 300win, whats the barrel length? In 30-06?
4 How much does one weigh?
5 How well made are these rifles?
6 How accurate do they shoot?
7 Pros and cons, the good, bad and ugly?

Mark, I can't answer all your questions, but I can make a couple of comments about the Sauer 80/90 series.

They actually sport a pretty unusual design, in that the bolt does not have "fixed" locking lugs. Rather the acion relies on locking lugs protruding from the bolt body when the handle is turned. That is (partly) what makes the action as smooth as silk when you operate it - you are essentially working a totally cylindrical bolt!

The action is rear locking, so some people are cautious using it with magnum calibers, although I have never run into anybody with an actual problem.

The action has a loaded chamber indicator - a little pin which will protude on the left side of the chamber when a cartridge is loaded. Pretty nifty little feature, which I have never seen on any other rifle.

The Sauer 80 in general had heavier barrels than the newer Sauer 90 series. Some people claim, that is what makes it easier to get a Sauer 80 to shoot compared to a 90. True or not, I don't know. Otherwise, the action used on the two models is the same.

Nice rifles - Sauer is pretty much at the top of the heap of European factory rifles. They normally shoot and work really well. If the rifle interests you, I would personally buy it. It will certainly be something different to the run of the mill "Remchester".
- mike

P.S. More specifically...

1 Does the Colt Sauer 90 have a 60 degree bolt? - Yes, both the 80 and 90 have 60 degree (or close) bolt lift - 3 locking lugs.

2 A tang safety? - Yes.

3 In 300win, whats the barrel length? In 30-06? - If the models exported to the US and sold under the Colt name are anything like the European models, then a .300 Win Mag should have a barrel length of 66cm (~ 26") and a .30-06 should come with a 60 cm barrel (~23.6").

4 How much does one weigh? - The European Sauer 90's in standard calibers were listed at 3.4 kg (~7.5lbs) and the magnums at 3.5 kg (~7.7 lbs). There are also short and full stock ("Mannlicher") versions available - at least in Europe. They weigh about the same.