When I first started reloading with Winchester primers, I thought seating the primers flush with case bottom was sufficient. I was wrong. When I experienced failure to ignite at pistol matches, all the shooters first asked if I was seating my primers fully. I told them, "Of course"
After we checked the rounds, there was a unanimous "You must seat them below flush to properly set the anvil. Seating them flush is not enough." Since I started seating the primers below flush, no more failure to ignite problems.
Tula primers are manufactured in the same facility as Wolf and I wanted to try them and see if I could experience any failure to ignite firsthand. Since last year, there has been reports of some lots of Wolf SP primers with harder cups failing to ignite that are silver in color. As far as I know, people have not reported misfire problem with bronze/brass colored Wolf SP primers.
The Tula SP primers I got (lot # 20-10) is dark silver/gray in color and should indicate whether current production Tula primers will ignite consistently. If there still is any primer cup hardness issue, it should be evident.
BTW, I have been using Wolf LP (lot # 2-09) since last year without any failure to ignite and so far, Tula LP (lot # 15-10) has not had any failure to ignite. These are all bronze/brass colored.