Thread: How does barrel twist affect ballistics calculations?

Hey All

I just got a set of Sig BDX binos and have been tinkering with the AB set up, I normally use the hornady app to work out dial up but there is a bit of a difference between the 2 calculators when im working out the same distances

My question is

Why does the hornady app require the barrel twist rate and the sig app doesnt and could this be the reason for the difference?

Cheers
Strider