I just created an account when I saw this, found the post searching for similar symptoms to mine. I bought my sport 3 weeks ago and it has bent a good number of cases so my issues have been identical to other posts on here. I assumed that it needs to "break in" but after bending 2 more cases today I emailed SW. Tried 7 brands of ammo through 3 brands of mags so I know it's something with the rifle. Other then that it's an excellent little rifle with amazing accuracy. To be fair i had a total of 5 bent cases / jams in 800 rounds (cleaned every 200) but every case shows scratching and small denting. I am very hopeful that S&W will fix it. Will call them in the morning.