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About 2 years back I used a .co.uk domain to point to my main .com site. After about 1 year I removed the 301 and put up some content (I was hoping the .co.uk would get in the uk only searches, which is didnt). At the time I noticed the .co.uk appeared to have the same PR as the .com - but on checking backlinks I noticed they where all from the .com - so the PR on the .co.uk was not real, only a reflection of the .com.
OK, to my point (at last). About 3 months ago I done a similar thing with an other site (301ed the .co.uk to the .com). The .co.uk had a PR of 1 and the .com had 0 (so it was genuine, only used for the right reasons). Both domains where several years old. On the recent PR update, the .com got 5 but the .co.uk did'nt. So I have the proof that 301's work differently from which they did in the past.
I think google have clicked on to the fact that many webmasters where using this method to fake PR (i.e. pointing a domain at a high PR site and removing the 301 once the PR appeared on the it). Has google introduced bad effects by introducing this? does 301's not work as they where designed to (i.e. pass along all previous pagerank and positioning etc.)? I think this tweak has introduced a domino effect, just not sure of all the effects yet.
Please post any experiences you have noticed in recent 301s.
As far as 301 redirects are concerned, I'll just say you can do alot of tricks with it. Most people are best off by not making frequent changes to a 301.
The point I was making is this - google has introduced a change to the TBPR in regards to 301's. If they have made visable changes to this, what other effects could this have on 301's?