Yes I did adjust the trigger when this first happened. It did not have any effect on the problem. I feel it's somewhere in the "reloading" area of this issue.
***Does the loaded round that "misfires" eventually ignite if you try it again? I'm going to try putting the discarded empty rounds ( bullet and powder removed ) with the dented primer in the action and see if it will go off?
I'm not touching the shoulders at the current setting for " neck sizing"
Primers are in a spare bedroom, environmentally controlled room.

...It's just strange how this has come to be. I've been reloading for years. Thank you for your input.