Raimey,
I have never seen the things you describe in the typical "pop up" sight. What donor cases are you using for the 6x70R ? Are you sizing them to 6x70R or will they already chamber. I try to avoid annealing until they will chamber and are trimmed to length. If a part of the neck or shoulder folds up, It will fail there. To avoid that, size the case in an intermediate step, depending on what dies you have on hand. Every obsolete case is a different story and it takes experience to work each one out. Every case you crush, or burn, or split adds to the experience, so don't look at it as a failure, look at it as a lesson.
Mike
