The above suggestion is the place to start but I'm wondering why 5 were OK? When lubing did you use enough on the inside of the case mouth? On the up-stroke, when the ball is sizing the inside of the case mouth, I have read that if you go to fast or don't use enough lube it can cause the shoulder angle to change slightly and that could also be part of the problem.
As for the 257, what is the twist rate of the barrel? That should give you an indication of what weight bullet to shoot.
My opinion on your new rifle is that it sounds like you made a good purchase. I love the short mags, and I have always liked the looks of the CDL SF. Enjoy your rifle.
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