Are ballistic charts/velocity/FPS based on 22 or 24 inch barrels?

deluxejunk · January 22, 2010, 09:37 AM

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.

rezmedic54 · January 22, 2010, 10:27 AM

Most are based on a 20 inch barrel

deluxejunk · January 22, 2010, 10:58 AM

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...

jmr40 · January 22, 2010, 11:07 AM

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.

Doyle · January 22, 2010, 11:08 AM

Quote:

Most are based on a 20 inch barrel

Definately not the correct answer.

lt dan · January 22, 2010, 11:25 AM

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".

January 22, 2010, 09:37 AM	#1
deluxejunk Junior Member Join Date: April 15, 2009 Location: Fredericksburg, VA Posts: 8	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.

January 22, 2010, 10:27 AM	#2
rezmedic54 Senior Member Join Date: April 25, 2005 Location: Arizona Posts: 288	Ballistics Most are based on a 20 inch barrel __________________ Kurt Pietrzak Maricopa Shooting Service S.W.A.T. South West Airsoft Tactical CCW Instrutor NRA Certified Instructor Gunsmith Maricopa ,Az. http:www.maricopashooting.com

January 22, 2010, 10:58 AM	#3
deluxejunk Junior Member Join Date: April 15, 2009 Location: Fredericksburg, VA Posts: 8	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...

January 22, 2010, 11:25 AM	#6
lt dan Senior Member Join Date: March 4, 2008 Location: south africa Posts: 328	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". __________________ If youth is wasted on the young, then Africa is wasted on the Africans

January 22, 2010, 11:07 AM	#4
jmr40 Senior Member Join Date: June 15, 2008 Location: Georgia Posts: 10,805	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.