So sounds like Garmin has the same limitation...
Stupid.
Seems like a very common scenario...
I bring Rifle A and Rifle B to the range.
I shoot a string with rifle A over the chrono.
I want to let Rifle A barrel cool, so I move to shooting Rifle B with a new chrono string.
I want to go back to rifle A now that it's cooled down some....but I can't go back and add to my original string?
Hope this gets updated. LR has had this limitation since launch...hope the Garmin listens to their audience and adds this ability (assuming it's not there as I'm anticipating...)