Out of my Brno o/u with 24 inch bbls I get:

Factory Norma 286 gr 2380 ft/s

286 Nosler with RL15 2360 (better is the 2330 area)

270 Speer with RL 15 2440 (better is the 2400 area)

250 Nosler BT with RL 15 2550

No pressure signs -- I have ejectors , so I dont know about the "falling out" - but the shells appear very normal and I mic the base and it shows no untoward expansion.

My rifle appears to like the 250 gr speed for upper and lower bbl combined grouping (about 2 inch at 100 yds) but each bbl loves (each bbl 3 holes touching) the 286 gr at 2250-2350 (but they separate about 4 inch vertical at 100yds)