I don't have any info with Rel 23 so I'm giving you what I have. Safe in my 6.5.x 06 , with E.R. Shaw stainless 24" bbl, 1/8 twist. I just worked this up yesterday on my home range. 51.5 grs IMR-4350 with the 121 gr Hammer bullet. [Linked Image from i.postimg.cc] Tiny three shot groups. Hope this is helpful. 54 grs of Rel 26 with the Nosler 140gr AB gave me 3075 fps.with no excessive pressure signs & also tiny groups.

Last edited by Hesp; 05/02/20.