You probably have more options with a Redding die - e.g. you can more easily determine how much of the neck and to what neck tension you want to size. This flexibility is bought at a somewhat (considerable?) higher price, when compared to the Collet die. Both dies allow you to size with very little runout.

The Collet die has the advantage that it does not require lubing, on top of its lower price. It can, however, be finicky to use - in particular with well used cases, which may require annealing. Like most Lee stuff, the design of Collet is brilliant, but the materials and the manufacturing process sometimes are not absolutely top-notch. "Cheap and cheerful".

Both the Collet and the Redding dies are not available in all calibers, although the Reddings are made for quite a few more cartridges than the Collet. Lee will reportedly make you Collet dies for any cartridge, but after 3-4 months I�m still waiting for my custom dies, so who knows?

The Collet dies are so inexpensive (about $20-$25), that it is almost worth getting one of those and see if you can get it to work, and like what it does for you. If not, consider shelling out the extra $$$ for the Redding. A lot of people here have expensive Redding dies sitting round, because the Collet dies were so much easier to use.

FWIW - mike

I agree. I can't really compare the two types, however, since I've never felt a need to replace the Lee Collet neck sizer. I've had no trouble with it and the groups I get are quite good.

Jaywalker