Rubberhead,
When you bought your rifle, did it come with a test target (more than likely a drawing of a heart) with a test group? If so, it should have listed somewhere on the target the make and bullet weight of the ammo used. European ammo is often loaded to different ballistics than American ammo. In my experience, European guns are often regulated with heavy for caliber bullets. You may find it worth your while to find out what ammo was used and duplicate those ballistics with your handloads. If the barrels shoot together with a duplicate of the European ammo over open sights, but not with a scope, you may need to have it reregulated with ammo of your choice. Of course, if the solution you have worked out is satisfactory to you, reregulation may not be worth the cost to you. There is a pretty good chance that you were able to buy the gun because the previous owner was unable to find a load that would shoot both barrels together, with a scope mounted.
Mike

Last edited by Der Ami; 11/02/23 11:32 AM.