ladder test ?'s

Discussion in 'Reloading' started by Ridge Runner, May 18, 2006.

  1. Ridge Runner

    Ridge Runner Well-Known Member

    Dec 13, 2002
    ladder test ?\'s

    To test a rifle with over 100 gr case capacity, what increment should the charge be increased by? In my 7 mm AM, if I start at 104 gr of wc 872 behind a 160 gr nosler, I think I'll hit pressure signs at around 106-107 gr.or exceed the velocity at which it should operate.
    a round loaded with 106 gr and left in a warm chamber for a couple min. while I made some adjustments turned out overpressure at 3679 fps.
    This 872 is funny stuff, so I'm kinda waiting for cooler weather to work up a decent hunting load, no use eating the barrel on a load now that will be underpowered come november.
  2. 4ked Horn

    4ked Horn Writers Guild

    Jun 13, 2007
    Re: ladder test ?\'s

    .3 or .4 gr if you are doing a ladder test.

  3. abinok

    abinok Writers Guild

    Nov 25, 2004
    Re: ladder test ?\'s

    Id use .4gr.
    im testing with some 872... this is some peaky stuff compared to the conventional extruded powders!