I have a question for all reloaders out there, can primers with age start to have inconsistencies? I have a bunch of CCI LRM primers I had purchased back in 2000 when I was reloading heavily, then life got in the way and they sat in my house until I started back into my old hobby with a new custom rifle I had built. My problem, I have ES on my Chrono that I cannot get down below 10fps consistently. I am using a Pro Chrono digital, the powder for my loads is new the cartridge is a 28 Nosler. My prep for each load session is the same, bump the shoulder .002, use my old RCBS Chargemaster (also purchased in Y2k), to throw the initial charge, transfer that to my Balance beam scale to verify weight and correct as needed, seat the bullet using Redding Competition Micro seater die, forgot to add use the CCI LRM primers purchased in Y2k. I find an accurate load at my 200 yard zero range, but when I go back and replicate the load, I cannot seem to get the same grouping. The original group would be .75 inch, then the next groups from the identical load would open up from anywhere between 1.5 to 2.75 inches.. The whole time, shooting over the Chrono on original and identical load, the ES is always greater than 20 and sometimes up to 40 in a 4 round volley. I have asked another individual about what I could be doing wrong, but was told quit shooting over a Chrono and just fine tune it using a ballistic app out to 600 yards, especially since it is an optical Chrono. The only thing I have not changed is the primers. Any information you could provide would be greatly appreciated.