I had the same problem with a Tradition Pursuit pro . I had to slam the gun hard with Winchester primes to get it to close , but with Remington clean bore primer it worked fine , but i had a lot of blow by . The Kleanbore primers fit just right in my Encore ( not Pro hunter ) . Don't have to slam it , and No blow by at all . I saw a tread where someone measured the length of all the 209 primers , I wish i new where i saw that !!