Quote Originally Posted by Jafar View Post
2" is only equivalent to appx 50 fps, so I would stretch to say it might have been twist rate. If the twist rate is the same on all tubes, someone is losing gas somewhere.
I used to subscribe to that general basic formula until I started seeing great variations that went both ways. YF brought his 16" Rem 700 out and it was FASTER than another .308 we shot... the two Rem 700's with longer barrels were SLOWER than my shorter barreled Savage.

In short, the more odd things I see the less "sure" certain things are... twist rates, type of rifling, number of lands/grooves, bore wear, etc., lots of factors that could add up for sure.

One thing was clear... ballistic charts and math is good, but as we all know, field testing is where it's at... another great benefit to training... seeing things that depart from the norm.