Thread: .270 muzzle speed

@grandpamac 22 inches

Greetings @Taco,
Most actual velocities I have found for the 130 grain projectile in a 22 inch barrel are in the 2,900 to 2,950 fps range.
I had an experience with a 7mm-08 rifle recently. I was shooting at 600 yards (550 metres) in an F class match. My handloads were chronographed at 2,800 fps and I ran a chart for the trajectory on the Hornady calculator out to 600 metres with a 550 metre zero. I can shoot at 200 metres here at home so I made up a target with the predicted point of impact (770 mm high) marked on it. Point of impact at 600 yards was a little low and slightly right. The target system we use also measures the velocity at the target which was within a few feet per second of that predicted by my chart which validated the BC used, my chronographed velocity and the Hornady chart. I could not have done this without the actual muzzle velocity. My muzzle velocity was very close to what I had predicted from the Hodgdons data after adjusting for barrel length. The velocity of factory loads is a unknown until measured. The chronograph used was an Oehler 35P with a screen spacing of 4 feet which is the most reliable of the optical chronographs. Currently I am developing loads in a different rifle for 1,000 yard shooting so it will be interesting to see how that turns out.
Regards Grandpamac.