Iowa 303, I'll be watching for your post--I've got a similar bore diameter situation and am debating options. (What part of Iowegia are you in? I'm "temporarily"--25 years and counting--stuck in eastern Nebraska.)

Eagleyes, I'm waiting on some samples of NOE's checks as an alternative to Hornady's .375 checks. For my purposes the Marlin tool works out better: the loading press is always set up here at home , but my arbor press is set up over at a friend's farm.