I have used my lee collet dies for many years. No problems
I use 7mm rem mag and I used to also use the collet die in 3030 win for a handgun. I sold the hand gun and sent the dies with it.
I find that when siseing after I sise I pull the case out just a little, spin it and redo The bullet always keeps its place when I do this.
I also seat the bullet way out out past max oal so that as I chamber the round the bullet contacts the rifleing, this insures that there is positive contact with the rifleing as soon as peasure builds.
For hunting I full lengh sise and seat the bullet to oal specs.
When I first got this rifle I had problems chambering after 3 or 4 reloads, a freind told me to trim the brass and once I started trimming NO PROBLEMS at all