@keenedge @Kisssofdeath
Well, I finally got to the range today to try my new IBI 22LR barrel with a stack of SK ammo. And then I had three fails to extract in a row and that's the end of that for the time being.
Sigh.
I was able to load and extract 22LR ammo just fine without firing it, but once fired the ammo would not extract AT ALL. Had to push it out with a rod, so after three in a row I was done for the day as I didn't want to mess around with things on the line.
I had measured the rim thickness of the SK ammo and the depth of the recess in the bolt and found them to be pretty much the same so I mounted the barrel resting against the bolt face. Perhaps this was too short a headspace? I will probably get a headspace gauge and try that, but that is a several week endeavour since it will be coming up from the US.
Attached are some images for you to ponder:
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The three rounds I fired off.
So, I think I figured out the issue - the IBI barrel is upside down, so the feed ramp is on the top, which is where the firing pin is as well. I suspect, based on the saddle shape to the rim of the cartridge that the lack of support to the rim where the firing pin hits is allowing the case to deform such that the extraction is compromised.
This would explain why
@Kisssofdeath had no problems with the combination and I did. I'm going to see if IBI can swap me a barrel with the correct feed ramp.
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Really hard to make out but the ammo itself that was loaded and extracted is slightly gouged but not horribly so. A feed ramp in the right spot would help with this.
I'm also going to try to lay hands on a 22LR extractor to see if that helps.
I need a beer.