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April 13, 2008, 06:53 PM | #1 |
Senior Member
Join Date: March 12, 2008
Posts: 165
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Factoring in Barrel Length: 22" versus 24"
Hello All,
As I begin my "deep dive" into reloading, I'm scouring this forum and other sites for information on ballistics for a .270. I found a good spreadsheet from Hodgdon, but the barrel length listed is 24". As I'm shooting a Browning Stalker with a barrel length of 22", I was wonder if there is a way to factor the difference. Is there a multiplier? Or do I need to find something specific to that barrel length? This is the site I mentioned above: http://data.hodgdon.com/cartridge_load.asp Thanks, DG |
April 13, 2008, 08:16 PM | #2 |
Senior Member
Join Date: February 14, 2008
Location: Kansas
Posts: 753
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The Lyman #47 manual says for a 2" change in barrel length the FPS change in the 2500 FPS range is 40 and 50 in the 3000 FPS range. Since all rifles shoot differently, aside from barrel length, you are always guessing unless you chronograph your loads. Elevation and temperature also change the equation as well.
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April 13, 2008, 09:26 PM | #3 |
Senior Member
Join Date: March 12, 2008
Posts: 165
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Tom234,
Are those numbers to be added or subtracted? DG |
April 14, 2008, 01:07 AM | #4 |
Senior Member
Join Date: February 14, 2008
Location: Kansas
Posts: 753
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Shorter barrel, less FPS
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April 14, 2008, 05:48 PM | #5 |
Senior Member
Join Date: November 30, 2004
Location: God's side of Washington State
Posts: 1,601
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In your quest for good shooting reloads, 2 inches of barrel will not be a factor. Don't worry about it.
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