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Winchester supreme 780

Discussion in 'Handloading and Reloading' started by dbro822, May 1, 2013.

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  1. dbro822

    dbro822 Member

    Mar 17, 2011
    East Oregon
    Anyone have any thoughs on this powder? LGS has a few pounds and I'm about out of IMR4350. Needing to load up some more 140's for my 264win mag.
  2. merrill

    merrill Member

    Nov 2, 2011
    780 Supreme gunpowder

    It is a slow burner. Slower than H4831 and 4350. I use in in my 270Winchester under a 130gr. bullet. My loading manual lists the top load at 59gr., H4831 at 55 gr. listed velocity for 780 at 2927fps. @60,900PSI It is a ball powder and measures very nicely. I rarely have to trickle the load. It is disigned for magnum loads. I use magnum primers in my .270. I assume you do also. I assume no responsibility for the data given. You are advised to reduce the loads I gave by 10% and work up your load using appropriate caution. It is my favorite powder for the .270W. BTW. Winchester Supreme 780 = 780 Supreme. I got the words mixed up.
    Last edited: May 1, 2013
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