I'm getting various opinions on this.
I went to a shop yesterday to get tubes for my 700x30 tire and realized an hour later after the shop was closed that the girl there gave me 700x23-28.
Two people (one an experienced mechanic) told me this is no problem.
Three people (one of whom said he used the wrong size before and it blew) told me to go back and get the right size.
Is there a consensus on this?