Upon closer inspection i think it doesn't work on all aircraft or it works randomly.
Due to the prop pitch bug on the 109/110 i've been fiddling around more with RAF aircraft in expectation of the hot-fix. I followed my own advice to set loadouts on a Spit Mk.II via the "player plane" option in the briefing/map screen and added some tracers to verify it, but they wouldn't display.
I've certainly had no problem setting convergence and bombs for 110s though.
I think the best thing to do at this point is manually create a few loadouts in the FMB.
Start up the FMB, select the relevant aircraft, press ctrl-click to place it on the map and start editing its properties: just set loadout options and save them.
Do the exact same thing with other aircraft you regularly fly, then exit the FMB without saving the mission. The loadouts should appear for selection in each mission screen.
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