how many times until a case trim?

[Recusance]

OK, I read the case length thread sticky'd above, but since I am new to reloading I still have a question.

after the first firing of my loads the case has stretched about .008. I assume this is now fire formed to my chamber correct? (supersonic load)

approximately how many times can I reload this case before I should trim it back to factory, specs?

after how many loadings should I re-size the case?

here are some pics of my fired cases, how do the primers look as compared to unfired case? (super sonic loading) 20.5 G of H110 under a 110 G Vmax from a 10.5" barrel AR15, Pistol length gas tube.




thanks.