Has anyone with a rifle chambered in .338 Norma mag. produced real world ballistics that agree with any of the charts currently available?

In particular I'd love to see this cartridge (in 300 gr. HPBT) directly compared (real world, again) to the .338 LM.

"Supposably" (to quote Joey from Friends) the .338 Norma round keeps its supersonic flight longer than a 300 gr. .338 LM.