Altitude and Twist

[hecksf]

This has probably been covered before but puzzle me this BenchMan.
When shooting at higher altitude do you need a faster or slower twist?

Ted

 

[alinwa]

You don't need anything different but you can get by with a slower twist.

I've got a rifle which I use for high country ground squirrels, up around 5000-6000ft. The load is so close to the edge that down on my range at 1000ft above sea level the bullets will keyhole below 50degrees.

al