I know we have alot of other gunsmiths on the hide here, so I thought I would try my luck at an answer.
I have a customer's push feed Post-64 Model 70 (.30-06) here that they've managed to break one of the extractor retention portion of the bolt nose off of (due to a blown primer on an overpowered load).
My first (and safest) inclination was to just replace the bolt for them and re-headspace the barrel, but we've had no luck finding any push feed LA .473" bolts available.
Other than the broken ears, the bolt is in fine shape. I've had the idea that a Tubb/Sako extractor could be installed, much like is being done on many Remington 700 pattern bolts. Problem is, I've had two other smiths tell me they "heard through the years that it wont work. I have no idea why"
Looking at the available material, I can't really see a reason why it wouldn't work, but does anyone have any solid input?
Thanks.
UPDATE:
After speaking with the customer, I went ahead and tried out the install on his bolt, as it was basically trash at this point. Turns out a Sako 75 extractor assembly will work just fine in a post-64 Model 70 bolt once you get the dimensions figured out. I used Tubb's extractor cut dimensions as a rough reference and adjusted for the shorter counterbore on the Model 70's bolt face and the actual length of the Sako 75 extractor vs. the Tubb versions. I just happened to have a reground 4 flute 1/4" solid carbide endmill that was spot on in diameter for the Sako extractor (+.008" width).
If anyone wants a reference for later, the main cut is as follows: Touch off on the end of the bolt and come in (X) .605" for the cut at .160" deep (Z) from touching off on the top of the bolt body.
Then a .201" hole drilled through (Z) to the FP channel at .504" (X),
Tubb's measurement for the plunger/spring hole worked fine for the Sako extractor.
I just eyeballed the rotation of the bolt so that the extractor was as close to exactly opposing the ejector as possible.
Now there's no real reason to do this on a Model 70 unless the extractor grooves are all screwed up, but being as bolts can't be had anymore it's maybe something you can keep in the back of your mind for down the road.
I have a customer's push feed Post-64 Model 70 (.30-06) here that they've managed to break one of the extractor retention portion of the bolt nose off of (due to a blown primer on an overpowered load).
My first (and safest) inclination was to just replace the bolt for them and re-headspace the barrel, but we've had no luck finding any push feed LA .473" bolts available.
Other than the broken ears, the bolt is in fine shape. I've had the idea that a Tubb/Sako extractor could be installed, much like is being done on many Remington 700 pattern bolts. Problem is, I've had two other smiths tell me they "heard through the years that it wont work. I have no idea why"
Looking at the available material, I can't really see a reason why it wouldn't work, but does anyone have any solid input?
Thanks.
UPDATE:
After speaking with the customer, I went ahead and tried out the install on his bolt, as it was basically trash at this point. Turns out a Sako 75 extractor assembly will work just fine in a post-64 Model 70 bolt once you get the dimensions figured out. I used Tubb's extractor cut dimensions as a rough reference and adjusted for the shorter counterbore on the Model 70's bolt face and the actual length of the Sako 75 extractor vs. the Tubb versions. I just happened to have a reground 4 flute 1/4" solid carbide endmill that was spot on in diameter for the Sako extractor (+.008" width).
If anyone wants a reference for later, the main cut is as follows: Touch off on the end of the bolt and come in (X) .605" for the cut at .160" deep (Z) from touching off on the top of the bolt body.
Then a .201" hole drilled through (Z) to the FP channel at .504" (X),
Tubb's measurement for the plunger/spring hole worked fine for the Sako extractor.
I just eyeballed the rotation of the bolt so that the extractor was as close to exactly opposing the ejector as possible.
Now there's no real reason to do this on a Model 70 unless the extractor grooves are all screwed up, but being as bolts can't be had anymore it's maybe something you can keep in the back of your mind for down the road.
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