I'll check it out thanks. The OAL in the Hornady manual for their 55 FMJs seams short but as mac1911 mentioned to me, the bullets are short and fat compared to other 55s. I did make some dummy rounds as long as 2.22" and they seem to chamber okay as far as I could tell. But used the length in the Hornady manual (2.20")
I realize I had the wrong trim numbers above on case length. I meant I trim to 1.740".
On load length even with those Hornady 55gr (which I use exclusively for that weight and for normal training) I'm loading them to 2.250. It's barely a diameter of insertion, but I've had no issues and excellent results. Sub MOA with IMR4320.