Your trying to energize a ball of metal twice some times three times ( maybe even bigger ) the size of the might wire its self, with the same current you would use to melt the wire under normal circumstances. That's why most if not all the times this ball is not removed your gun will push away before the arc is struck.
Yes it will probably strike a arc enough to start a weld but it will be a more than normal "cold start", remember one of the weakest parts of a weld is the start. As the energy to melt your filler is not there till the base metals heat up for a good fusion.
Clipping the end each times is what I was taught or with 7018 tap or scrape the end of the wire on concrete, but most of the time I would insert another rod into my stinger.
1993 YJ 4.0 60 Front, Rear steer 60, bolth spooled, 5.38's, 700r/241 39.5 iroks and beating it like it owes me money.
And on the 8th day, God created the 14 bolt....