I have suddenly run into a situation to where I am getting frequent FTF ina Model 11 that I have been loading and shooting with for more than a year. Now before you all start with primers not seated properly this has already been thoroughly gone through and eliminated as the problem. The one fact that has been consistent is that these unfired cases all measure .005"-.007" shorter after being chambered and struck. Never seen anything like this!

I have been using CCI450 primers of late and many of the fired ones show signs of cratering around the firing pin dimple while the FTF rounds all show very light strikes. Previously I was using CCI400 and they were cratering horribly and even had a few pierced. Not a high pressure issue because this would happen with even starting load charges. Also would not see this when fired in another rifle.

So tonight I ordered new springs, firing pin and wavy washer. This rifle has the new model one piece pin with 2 pc. spring.