100% correct!!! My new Rigby 470 DR did the exact same thing. I hand load. I just walked it in with four rounds each group only one grain apart. At 86 grains they crossed like yours. At 80 grains they stopped crossing but too far apart. At 84 grains all four shots within one inch at 50 yards. perfect!If you are a hand loader, reduce your loads. It may surprise you that only a few grains less powder and they will work their way back in the directing they are supposed to go. I've never messed around with a double thats "adjustable"....but I have loaded for with success quite a few doubles that just need load perfection to shoot right. When bullets cross like that too soon, that means too much velocity, too much powder. And the opposite is true on the other end of the spectrum....too little velocity and too little powder the right would shoot way right, left way left. Seems like an over simplified deal but it works. If you aren't a hand loader you are at the mercy of regulating to an ammo physically with the barrels.