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26inch barrel

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Unread 04-20-2010, 04:23 PM
Junior Member
Join Date: Nov 2009
Posts: 21
26inch barrel

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.
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Unread 04-20-2010, 04:35 PM
Platinum Member
Join Date: Mar 2002
Location: Wyoming
Posts: 2,612
Re: 26inch barrel

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.
Predictions are difficult, especially when they involve the future
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Unread 04-21-2010, 06:53 PM
Gold Member
Join Date: Oct 2007
Location: Patagonia Mountains, Arizona
Posts: 770
Re: 26inch barrel

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)
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