I made a simple spreadsheet where all you have to do is input your information into the corresponding block and you can see how you grains per inch (GPI) is compared to your grains per pound (GPP). I left all my information in for an example. Please let me know who this worked out for you. Jeff https://docs.google.com/spreadsheet/ccc?key=0AmUfMQEqrh7QdHgtd1dncHBPWks3TG9jMWJ4Ty12bVE&hl=en_US
