.257 Weatherby - Hodgdon RETUMBO

Discussion in 'Reloading' started by 300winnie, Sep 27, 2006.

  1. 300winnie

    300winnie Well-Known Member

    May 18, 2005
    Has anyone tried this yet?

    Looking at loading the 110 grain Nosler Accubond.

  2. brianwinzor

    brianwinzor Well-Known Member

    Jan 31, 2003
    Several days ago I broke in the Krieger barrel (7 twist)in my custom 257 Weatherby using AR2225 (HRetumbo in US)with the Wildcat 156 grain ULD.

    It gave excellent accuracy right from the start as I worked up from 60.0 to 65.0 grains of AR2225. The 65.0 grain load produced a .280 3 shot group, and a .485 5 shot group with the 4th shot pulled low spoiling a potential .300 group.

    Unfortunately my CED chronograph didn't work, so I have no velocities to report. Thankfully the OZ agent sent me 2 new sensors (free), and the chrono is working again, so in about 1 hour I will head out to chrono loads of AR2225, AR2218 (H50BMG in US), and H870 with the 156 grain Wildcat.

    My Norma 257 Weatherby cases hold about 78 grain of AR2225 to the bottom of the neck. So based on that, I believe there should be enough capacity to work up to maximum pressure with HRetumbo using the 110 grain Accubond in your rifle. Good luck on your testing. Brian.

  3. keithcandler

    keithcandler Well-Known Member

    Jan 30, 2005
    I tried 7828 and h1000 in mine and it was too slow. I hit a home run with R#22 with 215's. Start at 68g and go up, you should hit a home run with 68,69,70, or 71g, stop if you see pressure signs.

    good luck!
  4. Hired Gun

    Hired Gun Well-Known Member

    Apr 21, 2003
    With the 110 Accubond I found RL-25 to get the highest velocity with the least pressure and very good accuracy. I'm playing with IMR-7828 SSC and it is running a bit high on pressure at 3500 feet per second. I had to back off. Once these are shot up I'm going back to the RL-25.