Whats the problem here?

[ArmednReady]

So I have recently bought a Ruger SR9C, I took it to the range fired abut 200 rounds or so through it and in functioned perfectly not 1 problem for the record I used 100 rounds of remington 115 grain FMJs and 100 CCI blazer 128 grain or somthing like that with the aluminum casings, I know for sure the blazer had more powder, anyways I get the gun home and im kinda playing with it loading and unloaded the chamber to smooth things out, so then I go to put all the bullets away and I notice the bullet I was chambering and ejecting had actually been pushed down further into the shell casing when I put said round next to 1 fresh out of the box there was a noticable difference, now I know that over time chambering and ejecting the same round can cause this but I only did it maybe 10 times at most, so now that ive rambled on my question is was it the cheap CCI blazer? or was it because my recoil spring and other internals are still very new and crisp? Was it the gun or ammo or maybe even both?

[RollingCode3]

Ten times is way too many. Bullet set back is very dangerous. For carry rounds, I wouldn't chamber the same round no more than twice. After two times, it will be practice ammo.

[Vanilla Gorilla]

Is it just me or did you double post this?