[tcdford]

My springfield 1911 45 auto dents the mouth of the case during ejection. Not every one but most of them

 

[Chainfire]

The cases are hitting the frame on the way out. That is one reason people lower and flare ejection ports.

 

[danf_fl]

Welcome to the forum. We have an "introductions" area where you can say "Hi".

Approx how many rounds do you have through the gun?
Has this done it since it was new?
Are you running reloads? Or factory?

The first thing (if you have approx 5,000 rounds through it) would be to replace recoil spring.
Then, the tension of the extractor could be a little off.
If using reloads, are they on the hot side?

Can you post a pic of a casing showing the mouth and head stamp?

 

[tcdford]

I already replaced recoil spring and I shoot both reloads and factory thru it and same result for both I will post pic of case when I get a chance in the next day or 2 thanks for the help

 

[canebrake]

My money is on your extractor needing a tune-up.

 

[tcdford]

Here is the pics of the case mouth

 

[danf_fl]

Take a look at your extractor.
(Did you at any time drop a round in the barrel and allow the slide to go forward? That forces the extractor over the casing rim and then extractor loses tune.)