Chamber issue.Hi all I recently purchased a bergara b14 chambered in 28 nosler. Picked up 2 boxes (20 rounds each) of Nosler ammo loaded with 150 grain etips as it was all I could find in stock and took the first few shots with the rifle today. I shot a total of 5 shots and all 5 took some effort to chamber and all spent cases are showing ejector marks on them. Not super pronounced but just enough that I can feel them with my thumbnail. Not sure how serious that is as I'm new to this. When I got home I cycled all of the ammo through my gun and sorted it into 4 groups with the no. 1 group cycling as if on an empty chamber and the no. 4 group requiring significant effort to cycle with a few rounds being stiff enough that I didn't want to try to close the bolt. The grouping is as follows: Box 1, Group 1= 1 round, B1G2= 1 round, B1G3= 2 rounds, B1G4= 11 rounds. Box 2, Group 1= 2 rounds, B2G2= 6 rounds, B2G3= 5 rounds, B2G4=7 rounds. Now that I've somewhat explained the anecdotal information I have, what should be my next step moving forward? Also how concerned should I be with the ejector marks that I'm seeing? The primers are slightly flattened with almost non-existent cratering. Do you think that the chamber is tight or is nosler perhaps having serious issues with consistency right now? It seems to me that nosler is having problems due to the wide variation in "chambering feel" that I'm having. Thanks for any input! Side note, the first shot that I fired appeared to have a split case neck, however upon examination the case neck was not split but folded over and crimped for lack of a better term.