I made a goof today, while shooting a project. I was helping my wife shoot her project last night, and she was using Ilford Delta 400, so I had my meter set to ISO 400. I got up early this morning to tackle mine, and forgot to reset the meter to 100, as I'm using Ilford Delta 100. According to Ilford, this film will give excellent results if rated at ISO 50,100, or 200. I need to push to 400. My questions are, what is the likelihood that the negatives will turn out ok? (if added grain is the only result, that's fine) How would I calculate the development time, since Ilford doesn't recommend pushing to 400, and doesn't have any info for dev time? Thanks gurus p.s. Dev times for D-76 1:1 are 9 1/2, 12, and 14 respectively. Would 16, or 16 1/2 be a good guess?