I typically shoot tri-x 400 at 200 - to make sure I get enough density on my negative. It may not really be necessary, i don't know, but that's what i do. Question is this: When I develop, should I use developing times for it's rating at 400, or what I'm shooting, at 200?
Develop so the negatives print on #2 or #3 paper. With rollfilm, development is your 'rough' contrast control. Fine contrast control is in the darkroom when printing.