As mentioned, you must put a small chamfer in the neck with one of these http://www.lymanproducts.com/lyman/case-prep/vld-chamfer-reamer.php. You need one of these or these also http://www.lymanproducts.com/lyman/case-prep/outside-chamfer-tool.php. I think you can get a kit that has both of these and the pocket uniformer for about $20 or so.
They are supposed to be sized to their is a .0015" - .002" inteference fit so you will not be able to slide the bullet into the neck. This is controlled by the expander collar the firing pin punch is sitting in. Some dies offer a few different size expanders. Another option is to neck size with a die that lets you control the of the neck. For about $20 you can get you a Lee Collet neck sizeing die and with a little practice working with the setup, it works great.
Also realize the necks must be clean or the carbon will create a lot more drag on the bullet. I wrap 0000 steel wool aroun the nylon bore brush and insert the bore brush in a drill. I then lightly polish the inside of the necks. I generally do this before I resize. This will give you a nice smooth bullet entry and exit. You can pull a bullet and it should look as though it has never been loaded.
They are supposed to be sized to their is a .0015" - .002" inteference fit so you will not be able to slide the bullet into the neck. This is controlled by the expander collar the firing pin punch is sitting in. Some dies offer a few different size expanders. Another option is to neck size with a die that lets you control the of the neck. For about $20 you can get you a Lee Collet neck sizeing die and with a little practice working with the setup, it works great.
Also realize the necks must be clean or the carbon will create a lot more drag on the bullet. I wrap 0000 steel wool aroun the nylon bore brush and insert the bore brush in a drill. I then lightly polish the inside of the necks. I generally do this before I resize. This will give you a nice smooth bullet entry and exit. You can pull a bullet and it should look as though it has never been loaded.