Using Lee resizing dies, loaded several hundred rounds and then it started getting hard to use the die - had to exert more pressure - last three brass casings in picture.

After the second one, I took the die apart and cleaned everything - and the third one came out worse.

Not sure what is happening.
Can anyone tell me what I should do to fix this problem?
I didn't think I changed anything in how the die was set before this problem occurred, but I am less than observant.

After the second one, I took the die apart and cleaned everything - and the third one came out worse.

Not sure what is happening.
Can anyone tell me what I should do to fix this problem?
I didn't think I changed anything in how the die was set before this problem occurred, but I am less than observant.

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