I've generally used Efke 25 for years for my carbon prints. As Jim Noel says, and you can bank on his advice, a full scale negative is what I shoot for. Generally I'm at 1.8 to 2.5 DR. I develop in Pyrocat HD 2:2:100. I wish I could fins some more of this film because if you need expansion it will expand like no other. Don't use HP5 use FP-4 for sure otherwise you are wasting time and money. Take the advice of some great photographers here answering your question and get on with it. Good luck.
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