I've recently purchased an RCBS neck sizer die for my .223 Remington. I put it to work the other day and took out my once fired Winchester brass and neck sized them. I put together 10 cartridges of one of my tried and true loads to see if I could achieve better accuracy with the neck sizing process. Before I travel 30 minutes to the range I always chamber them in my rifle to see if they will feed and chamber properly. Well this time instead of a smooth chambering, I got a different result. This time the cartridge acted like the bullet was seated out so far that it was jamming into the lands, in other words the bolt would not close. The same C.O.A.L load that was full length resized instead of neck sized chambers perfectly. I am extremely oblivious to what I am doing wrong, anybody have a solution?
