I use the Lee collet neck dies for all my rifles cartridges except for one. I've had the same thing happen to me with my 7mm mag. I wouldn't worry about it too much unless the brass is really hard to chamber, especially if you're shooting at paper. For hunting I'd want something that chambers a little easier. For that you can full length size or use a Redding body die to size the body and the Lee die to size the necks. I do the latter.

I've had great luck with the Lee dies. I tune them up when I first buy them by polishing the collet and collet sleeve and applying a little grease to them. They work a lot better after this treatment.