So far I've loaded about 4000 NS primers without a single misfire or any other problem. The NS primers are a tight fit for first loading in 12 ga Rem Gun Club steel base hulls, even those that had been reloaded 3-4 times with Cheddite primers. That's with a MEC 9000 progressive. No problem in the 9000 with NS's and real brass bases as in Win AA, and Rem STS and Nitro hulls. Just last week and after a long wait I got a P-W 800 Plus progressive press to replace my old 9000, and it easily handles NS primers in any and all hulls.
