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257wby

Remington 700 gunsmith

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I would try Phoenix Custom Rifles or Eric at Axisworks. 

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On 1/29/2021 at 2:32 PM, SHOOTER said:

Sounds like a hot load or your ejector may be have a dirty plunger. Post pic of the case marring.

yep

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It is the same between factory loads and my loads.  My loads are straight out of the Nosler book.  Even when I put in a factory load, it seems like the head space of off as the bolt is tight to close.  This case was cycle several times, so the marring is a little exaggerated.

C4F1EB46-AD19-49E8-92EA-0B66B6B42466.jpeg

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I have a custom built .257Wby that looks like that with factory loads but they look fine in a Weatherby rifle.  I believe it is because the custom gun is not freebored like the Weatherby rifle so it develops higher pressures with the same loads.  I quit shooting factory ammo in it and only reload and carefully work up loads looking for signs of pressure.  I don''t know about Remington factory (assuming yours is) barrels in terms of whether they are freebored or not.  Just a wild thought and it would not explain why chambering a new factory round would be harder than you would expect.

Has the problem just recently developed?

By the way, the custom rifle I referred to is built on a Remington 700 titanium action.

 

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It has the same amount of free-bore as my old Weatherby Vanguard did.  It has been like this since day one and has even been returned to Remington to make sure it was within spec.  When I got it back it was only slightly better.  I sold my old Weatherby to a buddy and I load the exact same rounds for him with no issues as far as pressure.

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The ejector mark on the brass is a sign of high pressure. But that doesnt seem to be your only problem. Hard to tell without looking at the gun but almost looks like your bolt face needs squared/refaced/cleaned up on a lathe.

I would back the load off first and try that before doing anything drastic. Because you definitely have some pressure signs...Also had good luck with Todd at Southern Express

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Overpressure!  Especially in a belted case that does not headspace off the shoulder.  That is significant, not just a bit of shine.

Screenshot_20210201-060500_Chrome.thumb.jpg.8566e2ba53e1a44c83633f878bc9fee8.jpg

Have you measured your freebore/lands?  

How long since you cleaned it?  Thoroughly. Oil in the chamber?

Carbon ring?

Load recipe?  Velocity?

How much is your shoulder growing from new/fired?  FL bumped back to?

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Free bore is about 0.35 if I remember correctly.

IMR 7828 SSC. 69 grains @ 3425 fps 

115gr Nosler BT

this doesnt explain why the bolt is tight on a case right out of the box though.

Don’t know about the shoulder.

This is not a fair representation of the marring.  I was cycling the bolt several times with this case it.  I put some marker on the lugs trying to see where the tightness was.

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Can you extract a loaded cartridge after closing the bolt on it and check for rifling engraved on the bullet. That would explain a lot.

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If your bullet is not jamming the lands. It is probably a headspace issue. Too tight. Need to set the die to bump shoulder a little more or the chamber needs to have a little more cut out of it. 

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