I've been messin' with a Sendaro 7 RUM the last few weeks, can't find much data for em. Tried working up a load for the 160 gr Accubond using WC872 took 97gr to break 3000 fps, just quit there. Went to RL-25, 91 gr will push the 160 AB to an avg of 3349 fps in my gun.
Thinking of trying some Berger 168 gr, maybe not the 160 AB is sure shooting sweet.
Bought this Sendaro here on LRH, has Nates muzzle brake, a Jewell trigger and a sexy spiral fluted bolt. Fun gun to shoot, recoil is minimal can see my hits at 300 yds which is as far as I've taken it to date.
I too had a STW. Accuracy load was 160gr TSX over 79 gr IMR 7828 for 3351 fps. 80 gr would push it over 3400 but groups opened up.
With 150gr TSX, 81gr of 7828 would push it a tad over 3500 fps with decent accuracy. This is out of a Wby Accumark that had been to Hill Country Rifle.
My 7 RUM with 91 grs of RL-25 is not max out, probably could push 3400. Shooting real sweet, why bother another 50 fps isn't gonna do much for me and that elk won't know the difference.
I have used 869, retumbo, h1000, and I would have to say that the 872 is too slow for that bullet expecially that barrel length. H1000 is my go to powder for the RUMs. In the 7RUM I just posted pictures on, with the 176 and 180 grn bullets 869 seemed too slow. I was getting blazing speeds but ESs that bettered 75! That is untill I dropped her down. I think I was pushing powder and not getting a good burn. I used every primer under the sun. Same for retumbo. I got the 140s to go 3600 with 94grns of H1000 and sane ESs. I have a 28 in barrel that seems to be very fast. I cannot run max loads most of the time. I got the 176 molly Cauterucios going 3500 before I SAW pressure. Still easy to open bolt just a shiny ejector mark and hard to size brass. For some reason my 9 twist wont shoot the heavies though, so I am stuck shooting 140 AB at 3450 getting clovers at 200 and in the 1s and 2s at 100. I sure would like to figure out why all the heavies string horizontally though. If anyone could help me out on that I would appreciate it. I tried everything. Just threw some bullet lights through as a last ditch and bammo! No stringing good ES and nice tiny groups.