I use Hornady cases and they hover around 34.9 to 35.0 in the .224 Predator.
Edit: The above is after necking down the 6.5 brass but prior to firing. After firing, the brass volume is 35.3-35.4 before sizing.
Edit: The above is after necking down the 6.5 brass but prior to firing. After firing, the brass volume is 35.3-35.4 before sizing.

