Barrel blank stampings

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desertfox

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Hi

I just bought a new contoured barrel to be fitted to my Remington 700.I noticed that there is numerals stamped on each end.What are the meaning of such numerals?At the breech the number is 2186 and at the muzzle 2192.Is it possible those numbers are bore dimensions?Then the bore is tighter at breech than at the muzzle.Is it normal?The barrel is a Benchmark 224 cal.


Thanks Desertfox
 
Not too sure about the #s but I do know that some barrels in that caliber do come with a slight taper towards the bore. If I'm not mistaken CFs C8s have tapered barrels. Supposed to help with accuracy.



desertfox said:
Hi

I just bought a new contoured barrel to be fitted to my Remington 700.I noticed that there is numerals stamped on each end.What are the meaning of such numerals?At the breech the number is 2186 and at the muzzle 2192.Is it possible those numbers are bore dimensions?Then the bore is tighter at breech than at the muzzle.Is it normal?The barrel is a Benchmark 224 cal.


Thanks Desertfox
Click to expand...
 
desertfox said:
Hi

I just bought a new contoured barrel to be fitted to my Remington 700.I noticed that there is numerals stamped on each end.What are the meaning of such numerals?At the breech the number is 2186 and at the muzzle 2192.Is it possible those numbers are bore dimensions?Then the bore is tighter at breech than at the muzzle.Is it normal?The barrel is a Benchmark 224 cal.


Thanks Desertfox
Click to expand...

Funny how it is stamped on both ends , I stamp mine on the breech end only the the smaller # is the bore the larger the groove diameter .

I know savage barrels are larger at the muzzle because I have already measured some this is due to the button rifling process and not stress relieving after buttoning, the bore opens up a bit at the muzzle when profiled .
Now benchmark also buttons their barrels but I'm sure they stress relieve them so the hole should maintain the same dimensions , I lapp my barrels to keep them tighter at the muzzle as I'm sure benchmark would also do perhaps they stamped it backwards call them and ask about it.
 
email Benchmark and they will tell you what the numbers are and why stamped front and back. Their customer service is pretty good for email. I have never waited more than a day for an email reply.
 
Hi

Thanks for your help.Gary told me that the number at the breech is the reamer diameter and the number at the muzzle is the hone serial number.But he told me that the bore diameter at the muzzle is larger than at the breech.Can someone explain that to me?E-mailed 2 x at Benchmark no answer.Reverse taper bore.

Desertfox
 
desertfox,

For what it's worth, here's something that I'd heard about years ago. The button rifling swages the grooves and sets up internal pressure in the steel so they have to stress relieve to ensure that the barrel maintains it's dimensions when it's contoured. If done properly, the stresses are lowered along the length and equalized radially without reducing the barrel's hardness too much - but not entirely removed. When the barrel is turned in a lathe there is less metal remaining at the muzzle than the breech and those residual radial stresses cause outward expansion where there is less steel to keep it in check. The effect is supposed to be a diameter increase of only a few ten thousandths but it depends on the temperature of the stress relief, barrel thickness, etc. and generally not measurable by the average Joe. It did, however, cause endless hours of debate over button vs cut rifling...

Steve
 
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