With the right load, no double rifle is cross-firing.

With the right load, every double rifle will shoot the barrels with parallel trajectories.

There are many factors within a load which you may tune.
There are double rifles which seem to defy many different attempts to achieve a load which shoots to proper regulation.

The double rifle which fails all attempts to get both barrels to shoot parallel trajectories needs to be re-regulated at the gunmaker.

Cheers
Tinker