[Jaywalker]

Is there a web page somewhere that shows measured velocities of common factory cartridges? My Lyman's has a page devoted to measured velocities, but it doesn't include newer rounds, such as the .260 Remington. From this it seems the ammo makers don't really tell the real story, even when you factor in the barrel length differences.

Where can we find measured velocity data?

Jaywalker

[Master Blaster]

Speer #13 has a whole section on measuring ballistics out of different pistols of the same make and model, as well as info on factory loaded ammo. There is a section titled "why Ballisticians have gray hair".

This section explains the varriables that go into measuring velocity.

They also use actual commercial firearms for their velocity, and pressure testing, which is helpful (lyman usually uses a universal receiver, and a pressure barrel).

The speer manual also notes that for .308 win they used a 700 ADL with a 22" sporter barrel, and it produced higher velocities, than the 24" pressure test barrel, and higher velocities than the 700 ADL they used to test the 30.06 loads.

So each gun is a law unto itself, the only way to really know is to chrono the load and lot you are using in the gun you own.

:)