[Snubbie K]

"Velocity loss per inch of barrel decrease with various calibers"

"Ballistics by the inch"

This is an extremely interesting website. The people involved obviously put in a lot of time and expense to provide the very informative and extensive data listed.

Perhaps this site could be "stickyized" as well.

http://www.ballisticsbytheinch.com/

 

[kraigster414]

Re: "Velocity loss per inch of barrel decrease with various calibers"

A sticky it is. Thanks.

 

[Snubbie K]

Re: "Velocity loss per inch of barrel decrease with various calibers"

P.S. - I do see some difference in these guys results through their test gun set up as compared to some results for various calibers that others have posted for the same round with the supposed same barrel length.

Just as a "for instance": In considering the 44 spl. 200 grain DPX round from Corbon that I have researched in the past for carry considerations, I see that they list their results at 859 fps from a 3" barrel. In an article by Steven Camp, his results were around 1000 fps from a Taurus revolver with a 3" barrel.

I don't know how this kind of variance translates across the board and to the .380 in particular. As they say, "Your results may vary."

I have noticed that different guns often produce different velocities even though their barrel lengths are supposedly identical. Notice, as a for instance, some of the comments on the "Buffalo Bore" ammo site when discussing the results from his "real world. guns. Sometimes a gun with a longer barrel will give him lower velocities than another with a shorter barrel.

Either way, it does give us an idea of the velocity loss per inch of barrel decrease. That is the purpose of the experiment, rather than providing an absolute verdict on the particular velocity that any particular gun achieves with a given round.

 

[HowardCohodas]

Re: "Velocity loss per inch of barrel decrease with various calibers"

From the FBI Ballistic Test Protocol, it notes that the cartridge/weapon combination are to be considered a system. It would seem barrel length is only one of the variables.

http://www.greent.com/40Page/general/fbitest.htm

Test barrel results demonstrate a round's potential independent of any weapon factors which can affect performance. Test barrel results are the purest measure of inherent capability for accuracy and velocity. Repeating these tests with a service weapon shows how well the cartridge/weapon combination may realize that potential.