blackbearhunter,
Forget about using a different load for each barrel as it is a pain in the butt and sooner or later you'll most likely get the right load in the wrong barrel.

With your rifle, each barrel is shooting to a different (crossed) point of impact and the sights have been adjusted to be aligned with one of these groups.
What you need to do is to try and bring the groups together (using identical loads in each barrel) and when there is just one composite group from both barrels you can then worry about aligning the sights with the POI if necessary.

You can try other brands of factory ammo and also try different bullet weights and styles in the factory stuff.

There are MANY things that can influence where each barrel puts its group on the target but there are three things that often affect or change the grouping in a double and they are...
Bullet Speed
Bullet Weight
Bullet Type (shape and composition etc)

These things are the easiest to alter in an attempt to bring the groups together.

Reloading may be your only option if a suitable factory cartridge cannot be found.
But reloading for doubles adds to the enjoyment IMO!

Don't worry, you'll get it sorted!
Best of luck and like bonanza said, have fun while your doing it!