barrel lenght vs velocity

declan1980

here's a bit of a technical question for ye.
if a bullet manufacturer gives an advertised velocity for a certain round when used in a particular length barrel, will firing that same round from a longer barrel give a higher velocity?

tomcat220t

declan1980 wrote: »

here's a bit of a technical question for ye.
if a bullet manufacturer gives an advertised velocity for a certain round when used in a particular length barrel, will firing that same round from a longer barrel give a higher velocity?

No ,not always the case .....in fact ive seen 2-4" longer barrels than manufacture advertised and would be still not attchiveing stated velocity .You can simply have a fast or slow barrel !Also your chamber can have an effect on velocity,aswell .

tfox

The amount of jump the bullet has i.e how far it moves from the case until it hits the lands of the rifling has a big affect on velocity, hence why reloading gives you the opportunity to get it just right by lengthening the round

Hondata92

Very good article on same barrel length yet different velocities

http://bulletin.accurateshooter.com/2011/09/tech-tip-same-load-varies-in-velocity-with-different-barrels/

Tackleberrywho

Myself and Paulo6.5 Chron'ed 150 grain SST's out of my .308 20" barrel and His Styer Tactical elite that I think has a 22" barrel and there was no notable difference in speeds.

I never Chrono'ed my .223 and it is on my to-do list.
I keep forgetting to

Must also buy a chrono;)