I just dug up a ton of daffodils at my grandmothers house. I probably dug up 5 clumps of 100 bulbs each. All in bloom. And I did the same thing last year. (I personally find it easier to dig and transplant when something is in bloom - than trying to remember what color it was and where I want it.)

I found that all the bulbs survived, but I only got about a 50% bloom rate this year. That is fine with me, since I'm thinking long term about my landscape. The bulbs I dug up in bloom 2 years ago, I got close to a 100% bloom rate.