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I've shaved with everything from a 4/8 to a 10/8 and, while they may feel different, there was not much difference in shaving with them. I'd start with 6/8, but that is really a non-issue.

As for...

I think you can eventually get BBS shaves with a straight razor, if that is your goal, but it will take time, practice, work at it, and maybe even more time. If you think you're going to be able to...