I had an interesting morning. I have two rifles, one barreled in 243 the other in 260. The 260 would fail to eject 100% of the time, the 243 would extract-eject 100% of the time. Both bolt heads are setup exactly the same, .140 extractor ball, steel extractor, ejectors-extractor springs ".......even measured the bolt head face depths which were identical. yadda, yadda

Just for S&Gs I swapped bolts, put 243's in the 260, the 260's in the 243. Now both reliably extract-eject 100% of the time!
Go figure!