Partial Sizing of Bottle-Neck Cases?

[Catfish]

I have had trouble in some rifles when partialy sizeing the necks, but in over 90% of them it seem to work. As far as haveing any advantages I have seen none in accuracy, but with some custom rifles that had over sized chambers it would help with the cases splitting just over the web if you could get them to chamber. The only way to know if you`ll like it is to try it.