Intersting find at the range tonight.

Steel-Cased Bernaud ammo, or in your case nickle plated brass, the russians played around with this feature on some ammo, the theory is an expansion joint for rifles with a tight chamber resulting in higher pressures, the groove would iron out in the chamber and allow all that pressure to go somewhere rather then destroy the rifle, whereas chambers with more generous tolerances the groove would remain on the case even after firing. Good conversation pieces if nothing else
 
barnaul-.30-06-springfield-145gr-fmj-box-of-20.jpg
 
Interesting finds “why not “ something else I didn’t know
nomad 68 said:
:popCorn:can't wait to read the replies you're gonna get for calling Ted a "fudd" lol.
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Don’t bother man ...... there are old members who keep coming here for knowledge and solidarity and others....well I am sure you know the type.
Coming on here saying people who believe firearms ownership of the right are extremist then call people names.....funny I thought that was against forum rules
 
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yodave said:
Steel-Cased Bernaud ammo, or in your case nickle plated brass, the russians played around with this feature on some ammo, the theory is an expansion joint for rifles with a tight chamber resulting in higher pressures, the groove would iron out in the chamber and allow all that pressure to go somewhere rather then destroy the rifle, whereas chambers with more generous tolerances the groove would remain on the case even after firing. Good conversation pieces if nothing else
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Interesting theory, a solution looking for a problem though.

Grizz
 
yodave said:
Steel-Cased Bernaud ammo, or in your case nickle plated brass, the russians played around with this feature on some ammo, the theory is an expansion joint for rifles with a tight chamber resulting in higher pressures, the groove would iron out in the chamber and allow all that pressure to go somewhere rather then destroy the rifle, whereas chambers with more generous tolerances the groove would remain on the case even after firing. Good conversation pieces if nothing else
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I understood the groove was to help prevent case head separation in sloppy chambers with the steel case ammo. It doesn't stretch as well as brass does, and that groove allows for much more growth during firing.
 
Any idea of the purpose behind the "cannelure" at the top of the case's web? Looks like a good way to ensure case failures.

Edited to add . . .
Apparently the groove, actually a depression, is commonly added to steel cased ammo as a means to control pressure.
 
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