[Wild Bill Bucks]

I had a problem like that, here a while back. My problem was I had forgotten to de-burr my cases satisfactorily. Since then, I always remember to de-burr, and to use a spray, dry lubricant, on the bullets, before I load them into the brass.

If you don't remember to de-bur or lubricate, the bullets will sometimes push the neck back on the brass, causing it not to chamber easily. The manufacturer of the brass should make no difference, since you are only resizing the outside of the case. No matter how thick the brass is, it will all be the same size after running it through a sizing dye.

Try running a spent brass through your rifle, after resizing. If it loads easily, then something you are doing during the load process, is causing the neck to be pushed back.

Hope this helps.

I always full length size.