143 gr Hammer Hunters in 7mm rem mag

[RockyMtnMT]

What kind of chrony? Sky screen chrony will vary 100 fps depending on the sunlight and possible angle change to the bullet line of travel. Even more if both things are different.

 

[Jbumblebee]

It's an older Pact1. I'm tempted to get something new and have been for about 15 years.