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Any update on this?

The cartridge does protrude, yes, it has to be able to seat in the bolt face so that the extractor can get hold of the rim. Good call on the sharpie, that should tell you if you have to look elsewhere. Good luck. You were on the money Arc! It needed some more dremeling. Especially on that smallest part of the ramp closest to the base of the breach. (The hardest part to get to, go figure right).You were also correct that the bolt will ride lower with a round in it, causing it to rub when it normally wouldnt empty. I also got mentally hung up on how much of the base of the brass i

Yeah, it was rubbing on it before and I dremeled it down. So that could be it but is the brass suppose to protrude from the bore a bit? I'll go sharpie the ramp some more.

On a side note, how flush is the base of the round suppose to be relative to the bore face?

I have a Saiga .223 that wont fully chamber a round. The round will not fully seat into the breach/bore. The bolt/carrier without a round works fine and closes fully. I had to have the feed ramp remilled and ever since Ive had this problem. So I figured there must be some shavings in the bore but when I shine a light down there it appears pristine to me. I cleaned out the barrel the best I could with a .22 brush but still no luck. Any thoughts?