Spokewrench:
Did you ever find any solution to this? I have the SAME EXACT issue as you. 9mm, only R-P headstamps on XL-750. High primers, but just like .001 high, enough to cause lite strikes when used in my shield.
I already have the updated Primer slide.
I spoke with Dillon, Dillion said to adjust the timing, but the primer punch cup lines up perfectly with the shellplate, so I can't see how that is an issue
Checked the height of the primer punch / cup and as per spec it's between 1.380 - 1.390 (Did this like 5 times already)
Wondering if you came up with anything.
Thanks