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Ballistics = 6,5x55 trajectory with a little less punch in a short action.
I have been told by a ballstician at Norma that 6 XC is easier to load develop for and it is inherently more precise/ predictable. The Swedish team won the world championship when they started using 6 XC. The 243 can see pressure spikes and fliers as the throat start to wear, this has been removed from 6 XC. I don't really know, I just parrot the information. My 243 shot ok, but 6 XC is definitively in a different league for precision.
I know that any load I've tried in my 6XC has shot well, from 85gr to 105gr projectiles. It operates on a little higher pressure than the .243 so you get the same performance for a little less powder.
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