I've found with the Speer Gold Dot and the Sierra V-Crown 124gr bullets, 5.6gr, both at 1.125" oal, was a sweet spot for me.
1185fps avg out of a Glock 17. That OAL was also good in my Sig P365.
With the RMR Nuke 124gr bullets, I found they needed to be a much shorter OAL. I seem to remember...