Well it took a while but I think I am close. This is a stock Sendero cept for a break and trigger work. I am trying to stay with the 200 grain Accubonds. All loads Remington brass and Federal 215 primers. Retumbo did not shoot worth a crap regardless of seating depth. Tried 93,94,95 grains. 93 shot 1.5" and the groups went up from there at 100 yards to over 2.2". She just does not digest Retumbo I was getting worried and per my other threads was thinking it was runout causing my grief so I am waiting for my neck turning tools and die bushings to arrive. So many fellers here said their senderos loved Retumbo. Thought mine had to as well and was thinking I got a bad barrel. H1000 did just a little bit better. Tried 88,89,91,92 grains. 89 shot 1.00", the rest was 1.5-1.7" 3.680 seating depth. Reloader 25 shows promise. Tried 89,90,91 grains per what other posters quoted. 89 grains did .55" right off the bat. 90 did .70 and 91 was at 1.00 but I pulled the last one when the shooter next to me shot his magnum and made me jerk. 3.680 seating depth. I will continue with the Reloader 25. Hopefully when I turn my necks and get runout down things will improve. These loads varied two thousanths-six thousandths runout. No pressure signs at all with any loads. Can anyone with quickload quote approx velocity with 89 grains RL 25, 26" barrel, 200 grain AB?