Remington 700 bolt marks on breech

[sadmazor]

Hi

I've just taked off factory barrel and noticed marks of front lugs surfaces on breech face. Same picture Ive seen on another Rem700 with custom made ss barrel with proper space between. Why it happened even with proper measurments and gunsmithing ? Need more than 0.010 clearance between bolt lugs and breech face ? Or its OK and just barrel/bolt/action flexing under recoil ?

Best,

 

[spife7980]

Is it oriented correctly? Aka, the marks are actually supposed to be top and bottom where they are placed when the bolts closed and they arent rotated 90 deg and its actually from slamming the bolt forward before engaging the locking lugs?

It’s generally not great… but if its shooting to your expectations then leave it alone.

 

[lash]

How many rounds on the barrel?

 

[Mike Casselton]

Those look like marks from dry firing on a barrel with too little clearance on the breech face, bolt nose.

 

[sadmazor]

How many rounds on the barrel?

3600

Is it oriented correctly? Aka, the marks are actually supposed to be top and bottom where they are placed when the bolts closed and they arent rotated 90 deg and its actually from slamming the bolt forward before engaging the locking lugs?

It’s generally not great… but if its shooting to your expectations then leave it alone.

yep, the barrel on photo was oriented like it was in receiver, vertical lugs marks with closed bolt

Those look like marks from dry firing on a barrel with too little clearance on the breech face, bolt nose.

Hm...it was a lot of dry firing on this rifle. Interesteing...

 

[lash]

The reason I asked is that while I can see the marks, they look more like just kissing the breech than impacting it. I had similar marks on the breech of a .260 barrel I pulled at about 3500. Once I cleaned up the barrel and breech, the marks were at most cosmetic.

 

[Rubicon Precision]

Clearance could be a mile when locked up, but the bolt handle may be sitting pretty far back allowing contact on an empty chamber.
The marks are a non-issue. As long as the bolt isn't touching the barrel while in battery with a round in the chamber, what ever happens when cycling empty or dry firing doesn’t matter.

 

[Rubicon Precision]

To clarify. On an empty chamber, there’s two things that stop the bolt from going forward. The front of the bolt against breech end of the barrel or the bolt handle on the receiver.