Wasn't expecting this so soon, but today a gift from my folks arrived, a Caldwell "Ballistic Precision" chronograph.
Well then, excellent! With a little luck I'll both get zeroed and be able to do a preliminary test on both chrono and TalonP, this weekend.
UPDATE: Grr. I couldn't get anything at all to record today; the unit kept failing consistently on the stop screen. I may have to do an exchange.
UPDATE 2 (12/1): Well, credit Battenfeld Technologies for a positive customer service experience. It seems that I may have acquired an earlier edition of this model, wherein this problem is not unknown. A later-edition replacement has been promised as soon as they can get it out the door. Stay tuned!