Barrel twist code?

[olddav]

I have a 30-06 barrel the the letter Y, can anyone else comfirm?

[Evlshnngns]

Stevens g code build date, .223 marked s7 sp7??? Ill check what it is next time I clean it.

[celltech]

.308 12FV - "SP24" and "F16" stamped on it...
.308 Axis II XP - "SP26" and "A29"
.22-250 12FV - "SP11" and "A902"
.22-250 12FV - "SP24" and "A21"
.223 12FV - "SP2" and "A11"


So yeah, I am not sure this means anything about a twist rate...

[J.Baker]

Those are the proof and assembly stamps. The caliber twist mark is usually covered by the barrel nut as it's stamped on the forward edge of the threads.

[Hotolds442]

338 WinMag 1-10” V
300 WSM 1-10”. D1