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Without regard to caliber or rifle, what you describe sounds like one of two things, maybe three.
1. Overly long chamber, in-so-far as headspace dimension is concerned (distance from bolt face to datum line on cartridge case). In itself, likely not to be dangerous, though it will lead to shortened case life, and could screw up your rifles chamber, in case of head separation. The dimensions of chambers in new rifles are USUALLY within SAAMI specs, though "stuff happens"
2. Shoulder pushed back to far in reloading or loading at factory, thereby creating an "excess length condition". Factory ammunition is usually dimensionally correct, handloads or reloads are another thing entoirely, depends on who did the reloading.
3. Chamber pressure to low, not enough powder and or the wrong powder, to slow burning, though come to think about it, this would more likely create what looks like a "flattened" primer. This is usually a sign of high pressure, though you could see it with low pressure too. Not likely dangerous, unless you end up with a bullet stuck, unnoticed, in the barrel, and fire another round.
What you describe as "primer backout", so far as I know, is NOT normal.
[This message has been edited by alan (edited April 24, 2000).]
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