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Discussion Starter · #1 ·
Greetings all. I'm new to the form and am grateful for all of the knowledge on here - it's been beyond helpful.

I recently purchased an A5M XP 308 in 24" barrel. Absolutely love the rifle. I've shot about 100 rounds through the rifle and I've noticed some odd scarring on the face of the receiver tail, just behind the ejector port (see picture). I've never experienced this from a bolt action rifle and I can only assume that it is from cartridge contact after ejection. Has anyone else on here experienced this? The extractor works well - throws the case several feet and the scarring seems to happen regardless of how far the cartridge is ejected. I'm firing brass cased American Eagle/Federal 150 GR boat tail rounds. Thanks for any info/shared experiences! 20150317_195324.jpg
 

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Discussion Starter · #3 ·
Sometimes gently and sometimes more quickly - scarring seemed to happen with both quick and slower bolt pulls (according to my spotter). Is this usually a symptom of slow bolt pulls?
 

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My A5m does not do that, then again, I also usually have my fingers by the opening to catch the empty case, but even when I don't, it doesn't leave marks. I guess I pull the bolt back fairly slowly, because I've never had brass thrown more than a foot and a half maybe. Even going slow, it ejects really well (a lot better than Rem 700's and Savages)
 

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Maybe. I'll play around with mine for a bit in the morning and see if I can get it to do something similar. It seems like the brass would have to hit the receiver pretty hard to leave brass marks.
 

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Okay, got mine to do it, but I had to pull back on the bolt very fast for it to happen, faster than what I normally do. Maybe if I was doing competitions with it, it would happen more often.
 

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It defiantly looks like brass transfer from the mouth of spent casings contacting the receiver, I've seen it on other rifles but not on my A5M. I would imagine based on my experience the brass transfer would come off with a little cleaner.

I'd cycle a spent case slowly and see how long the extractor is hanging onto the case, then also place a piece of black electrical tape on the rear of the receiver and cycle the action with the spent case quickly to see if it leave a mark on the tape.
 

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Try working a little oil on the ejector and extractor. Remove the bolt for the gun, and use a fired casing to work the ejector and extractor. My gues it's possibly a bit tight or binding, holding on to it longer.

Try different ammo, as the extractor cut might be a bit thicker on the brass.
 

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Try working a little oil on the ejector and extractor. Remove the bolt for the gun, and use a fired casing to work the ejector and extractor. My gues it's possibly a bit tight or binding, holding on to it longer.

Try different ammo, as the extractor cut might be a bit thicker on the brass.
He's got an A5m Sony, fixed ejector and claw extractor. I think it's a matter of the speed at which he's ejecting the rounds. Looks like around 25 marks on it, so it's not happening all the time.
 
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More importantly, it's cosmetic. Personally I wouldn't worry about it. That rifle's a shooter so shoot it.
 

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Discussion Starter · #13 ·
Thanks for all of the great insight/advice friends, much appreciated. I put some protective tape on the receiver to reduce scarring. Will also see if this continues with Gold Medal Match ammo, been using the less expensive American Eagle 150s at shorter distances.
 
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