Remington 700 build sheet discrepancy

[VA_XTC_Shooter]

I am going to chamber a new barrel for my 223 Borden action in an Eliseo chassis (0.200” recoil disc).

I took the measurements from the action per the attached remington 700 build sheet.

I noticed some wear marks on the front of the bolt lugs so I measured the barrel that came on the rifle (no clue who chambered it, no markings and bought gun used).

There are quite a few discrepancies in what measurements I took and what the build sheet recommends and what the old barrel was cut to.

It appears the old barrel was cut to tighter tolerances (tenon length and bolt nose clearance).

This made me question the calculations on the build sheet. The tenon length difference is just a difference of clearance added in, same as the counterbore depth. But I am struggling to understand why the headspace protrusion is so different (+0.007 vs -0.014).

I would think tenon length should be .832" (0.002 crush and 0.008" clearance from lugs).
Counterbore should be 0.147 or .148 like the current barrel because the crush and clearance is already accounted for in the 0.832" tenon length.
The Go Gage protrusion, appears to again be correct in the current barrel at -.014" allows for 0.002 crush and 0.001" over 0.

 

[VA_XTC_Shooter]

To add more to the confusion, here is the Borden drawing.

https://bordenrifles.com/wp-content/uploads/2021/10/alpine_timbreline_stub.pdf

 

[Dusty Stevens]

Dont account for crush, especially .002, unless your machining just isnt very sound at all. No matter what somebody else measured you go by your measurements. You have no idea of the tools they used, if they can measure at all or if their tools were zeroed. Just throw that sheet away and do your own thing (just a piece of advice after going behind folks on everything from motorcycles to gas turbines)

 

[Walt Krafft]

Over the years the dimensions of Rem 700 actions from the factory have varied and have been changed by gunsmiths attemting to improve them. You must make your own measurments and build sheet. Properly machined and assembled there will be no crush.

 

[gunsandgunsmithing]

It appears also, that whoever did the print accounted for counterbore depth twice. Allowing .010 clearance with both tenon length and counterbore depth, giving .020 clearance.
Reason enough that I wouldn't trust that person's measurements. Mistakes happen but everything should be at least double checked, if not more..and this would've likely been caught.

 

[DaveTooley]

I have two log books with thousands of dimensions recorded for mostly 700's. I have logged three measurements from day one.
HS - tenon length=HS -.010" - actual counterbore of the bolt nose.
HS pretty simple. HS -.010" gives a tenon length that does not touch the bolt lugs.
On a manual machine I would then touch a boring bar to the tenon then set a travel indicator. Then just bore to the CB depth number. Automatically gives you 10 thou end play clearance. I go .715" on the ID. The last thing you want is the bolt touching the barrel. They get wild as a billy goat if they do touch.
example
HS .880" tenon .870" CB .145" If I trued the action then I would add +.010"

 

[butchlambert]

I love my Trav A dials.