I did have a high cull rate for damaged case mouths (about 10% were dinged beyond recovery) with some Nosler blem .270 Win brass I got from SPS. To me that's not a blem, but a flaw that should have been recycled. I saved them because they could still be necked down to 25-06 or 6.5-06 and been fine, since trimming back to 2.484 would have cleaned up all the chips that were a problem at .270 Win length.
But my buddy bought a bunch of blem 6mm CM from them and he found them just outstanding.

Rex