7mm-08 reloads extraction issue - thoughts please

Well I spoke too soon. After another couple of excursions and more range time we still get sporadic occurrences. Dealer says it's a brass re-sizing issue. But I don't accept that a round that chambers freely has a resizing issue. And once fired it is fire formed to the chamber. To me it's simply an extraction issue that appears at a particular pressure threshold. So back to reducing the load further. Maybe even a different powder with a different pressure curve.

Somehow I doubt Ruger, or their local importer, is going to care too much.

Quote:

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Originally Posted by Jhon

Well I spoke too soon. After another couple of excursions and more range time we still get sporadic occurrences. Dealer says it's a brass re-sizing issue. But I don't accept that a round that chambers freely has a resizing issue. And once fired it is fire formed to the chamber. To me it's simply an extraction issue that appears at a particular pressure threshold. So back to reducing the load further. Maybe even a different powder with a different pressure curve.

Somehow I doubt Ruger, or their local importer, is going to care too much.

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Have you tried checking the headspace via the masking tape method I described?

Reason I said to take the firing pin out, I said use a factory round (live) as they are usually very under-sized. A single layer of masking tape is close enough to approximate a No-Go gauge (some gunsmiths use this method to check headspace to avoid ordering gauges).

Aside from a chamber cast, this is the easiest way to tell, otherwise you will be going in circles.

Well actually I took @vietnamcam advice above and spent a bit of time online.

This (poor quality) YouTube video from frame 14.18 and frame 16.07 specifically shows the exact repeat extraction issue identical to the rifle in question. The guy is shooting a brand new American in 308 with factory ammo.

The comments below the video confirm this is a regular issue with the Ruger American and likely caused by the bolt design and QA thereof.

Back to the importer I guess. If they won't come to the party the next step which seems to be favored by some is to polish the crap out of the bolt mechanism and grease lube it. I.e address the poor factory quality control re parts finishing.

Anyway.

https://youtu.be/m6JejNtKjJY?si=8EZAksuLr6SMm9op

Quote:

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Originally Posted by caberslash

Have you tried checking the headspace via the masking tape method I described?

Reason I said to take the firing pin out, I said use a factory round (live) as they are usually very under-sized. A single layer of masking tape is close enough to approximate a No-Go gauge (some gunsmiths use this method to check headspace to avoid ordering gauges).

Aside from a chamber cast, this is the easiest way to tell, otherwise you will be going in circles.

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Will do this if we are left with having to sort it. Polish the bits at the same time. Thks.

Is this a possibility?

https://youtu.be/v28BfzwbsVc?si=j9hLyKJ4dwy7yYfT