UC

But,! - I have found that the lock-up is more effected by the diameter of the 209 than the length. There is a taper to the battery cup. Some primers fit better because they are able to go deeper into the pocket than others that have to large of a diameter to drop in as far as others - thus they stick out to far.

Does this make any sense to you....

When loading shot shells you really notice the different diameters of the various shot shell primers....