I got a run of one hour with my Hunter 7mm 145gr 5 banger. Not sure how many but about 2" deep in the bottom of the 10 Gal bucket I use t water cool.
These are for nose sizing for my new FA single shot as I want to try nose sizing before having to neck turn all my cases. I am having the odd round fail to go in even when the seating depth is the same. ZWith no camming action with the break-open design all just has to be perfect. In my XP I use a very soft crush fit into the lands. Not possible with the FA. Peter.