Muzzle velocities for 20" .308 barrel

[TheCanadianOne]

For those who shoot. 308 out of a 20" barrel and have measured it, what was your muzzle velocity? I'll be primarily shooting 168gr Federal GMM SMK out of a 1:8 twist M24 profile barrel and while it shows a muzzle velocity of 2650, I believe that's out of a 24" barrel. I need to wait for my Grayboe stock to arrive before I start hitting targets and I doubt I'll have access to a chronograph so I'm trying to get what information I can on it.

 

[grumper]

2485fps for the 175gr GMM out of my AT with 20" barrel.

Aw hell I have no idea what twist mine is. Could be either 1:10 or 1:12. Seeing conflicting info.

 

[Vaquero]

All I got is a Monty Python movie quote.

 

[TheCanadianOne]

All I got is a Monty Python movie quote.

Are youvsuggesting bullet velocities migrate?

 

[Big Dipper]

Remington 700, 20”, 1:10
168 gr. Sierra BTHP over 42 gr. Varget
2,480 fps

10 rds, 100 yds, 1” squares

Could possibly have gone higher in speed, but had no need to for my purposes.

 

[Mike_from_Texas]

Every rifle is going to be different.

My 20” R700 5R Milspec shoots 175 Bergers at 2800, has shot 168 grain Accubond Long Range at over 2950 and shoots 150 grain Hammer bullets well over 3100fps.

I unapologetically push it hard with small rifle primer brass but my rifle also has a cavernous freebore of about .220” over SAAMI if 2.800.


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