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Originally Posted by kurtz
....thats a pretty healthy ejector strike in the base....
kurtz
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I agree, it looks like either those heads are very soft or your loads are very hot. You shouldn't see the circle from your ejector and line from the extractor. Your brass is flowing back into those spots on your bolt.
I was experimenting with my .223 and had the same thing when I dropped 27.5gr of H335 to reach 3150fps out of my 16". I backed it down a bit.
Measure the diameter just above the extractor groove on the case and compare it to another unfired case, it shouldn't be more than .001" larger.
Jon