If the new round chambers but will not fire and there is no mark on the primer then you have tripped the accutrigger. This is when the safety blade is not depressed and the sear slips past the trigger step and is caught by the safety blade. Normaly adjust ing the preload on the trigger will fix this.
The other problem sounds like either the headspace is to short or the bullets are seated too long. Do you reload for this rifle?
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