While it is not ideal to fire 50 plus rounds without a clean it shouldn't build pressures that much to blow primers.

My 9.3x62 would have fired that many at the momment as my cleaning gear is at my house that I cant get to with the floods.

When roo shooting I would fire 80-100 rounds a night from a 220 swift,22-250 and 223 without problems.

My Father doesn't know what a cleaning rod is and would have fired hundreds upon hundreds of 338 win mags without cleaning it.

My money is on Hornady loading their ammo to within an inch of its life ( and yours) .