26inch barrel

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by saskhunter, Apr 20, 2010.

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  1. saskhunter

    saskhunter Member

    Nov 3, 2009
    just curious if any one knows off the top of there head how much fps i would gain if i went from a 24 inch barrel shooting 3000fps to a 26 inch in 300wsm. im bored right know and im thinking about my future build and wanna play with a ballistic calculator. :)
  2. Long Time Long Ranger

    Long Time Long Ranger Well-Known Member

    Mar 12, 2002
    The 300 wsm is a very efficient cartridge using faster burning powders than most magnums. For that reason it would not gain as much with longer barrels. I have not tested it though so could not get you a number. An educated guess though would be less than 25 fps per inch. I would guess 20-25 per inch.
  3. LouBoyd

    LouBoyd Well-Known Member

    Oct 15, 2007
    Since you stated 3000 fps for a 300 WSM I assumed a 168 grain Hornady A-max and Hodgdon H4350 as that's a "factory pressure" load according to Quickload which gives close to 3000 fps. By adjusting the load a bit to give exactly 3000 fps then changing the barrel length from 24 to 26 inches Quickload showed 3055 fps. Changing the bullet and powder could give a range of answers, but that's in the ballpark.
    ( close to LTLR's educated guess)