The most used calibres in France are 300 WM, 7*64 and 9.3*62.

The guides in Gap can’t forbid any calibres but are pleased with 300WinM and 7RM, and 270WM now.
The 6*62 Freres is a specialist calibre and accepted too.

The 9.3s are a no-no, not flat enough trajectory.
The 7*64 is admitted but is the bottom line.
The 243 isn’t bad but the hunter has to take care about the placement.
Lower calibres are critical especially by windy conditions.

Anyhow most of the hunters use either 300WinM or 7RM…………legally under 300m.