I have about 500 Nosler cases for a 7mmMag that I've had for little over a year now and I was wondering if these case are chamfered at the neck or will I have to chamfer them before I load them? These cases are Nosler seconds.
The purpose of chamfering the case mouth is to provide an angled surface for your bullet to enter the neck without getting "shaved" on the way in. Some chamfer reamers are much better than others.
I prefer the VLD reamer on the right. Don't be afraid to over-do it. However, the mouth of your case shouldn't have a knife edge either.