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Old January 22, 2010, 09:37 AM   #1
deluxejunk
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Are ballistic charts/velocity/FPS based on 22 or 24 inch barrels?

The reason I ask is that I have 24 in barrel model 70 in 270 that I am going to sell to buy a Model 70 Featherweight with a 22 inch barrel. I realize that the drop is around 30 fps for every inch of barrel, but what are the manufacturers starting with? A 22 or 24 inch barrel? Same thing goes for my Remington BDL in 25-06. Do manufacturers use a 22 or 24 inch barrel?

I guess it could be by model because surely they wouldn't use a 24 inch barrel from a 7mm-08 when almost all of them I have seen have 22 inch barrels.

Thanks for the input.
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Old January 22, 2010, 10:27 AM   #2
rezmedic54
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Ballistics

Most are based on a 20 inch barrel
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Old January 22, 2010, 10:58 AM   #3
deluxejunk
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Wow!

Thanks for that information. That really raises the listed velocities and information you might see on a box of say Hornady ammo where they list their bullet muzzle velocity, FTP, drop, etc...
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Old January 22, 2010, 11:07 AM   #4
jmr40
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Most are based on 24" for standard calibers, 26" for magnums and 20" for pistol calibers fired in rifles. I think you will find very little difference between a 22" and 24" barrel in a 270. I doubt it would be 30fps total.
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Old January 22, 2010, 11:08 AM   #5
Doyle
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Quote:
Most are based on a 20 inch barrel
Definately not the correct answer.
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Old January 22, 2010, 11:25 AM   #6
lt dan
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this is fascinating. in s-africa the reloading chart state the test barrel, of all the calibres ,of whom all are 24" and one is 26".
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