"One man's ceiling is another man's floor."
I have a hard time visualizing how a forced primer can set off the tube on a Dillon press, at least a 550. The primer seating function is about 2 inches laterally from the primer tube.
Anyhow, I fired my first 50 with the small rifle primers. I could not tell any difference from my normal load. I think I'm with M&P and will use them when it is too much trouble to recover the brass.
BTW- I only use small rifle primers in all small primer applications and have for a number of years. One less thing to keep up with.
PS - I bet it was due to using One Shot!