Question on 7.62 brass

[Gin&Tonic]

Starting to reload for my M1a NM and I've been doing some research on brass. I know that 7.62 and 308 have different volumes, and my question is...do all NATO cases, regardless of headstamp have the same reduced volume due to a thicker case wall? I've got a supply of once fired Nato and there are 3 headstamps...Lake city, IMI, and FC. I understand LC and IMI are basically interchangable according to Zedikers treatese on m14 loading, but just wanted to understand that all NATO stamped 7.62 is the same volume. Am I correct here?
thanks

 

[cpatbay]

Re: Question on 7.62 brass

Unless you are loading for precision or at max load, the slight difference won't matter.