UPDATE PRECISION RIFLE CLASS March 12/13

[Evil_McNasty]

2" shorter barrel and it was still getting hits 10" higher? What are you thinking is the disparity there?

[Jafar]

2" shorter barrel and it was still getting hits 10" higher? What are you thinking is the disparity there?

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.

[Airgator0470]

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.

[Jafar]

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.

Have you seen Todd Hodnett running 18" .338LM's? He says he's getting better results with shorter barrels and will possibly never build other rifles with anything longer than 20" tubes.

[Evil_McNasty]

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.

Maybe the faster rifles have more wear on the rifling? Less friction

[Airgator0470]

Maybe the faster rifles have more wear on the rifling? Less friction

Was my post in the works...