Thanks for the reply.
It's a 125 gr Nosler I'm loading.
https://load-data.nosler.com/nosler-...-AAC-125gr.pdf
Which lists 2.260 as max length for that bullet.
With my measurement (and allowing for a healthy .010 thousandths of jump) that would put me loading at 2.30 which is a whopping 40 thousandths over the company's stated max.
Factory loads measured in the 2.210 have functioned without flaw.
New enough at this that I'm wanting to make sure I don't blow something up.