Anyone know the average velocity of a factory SST from a Lilja AR740 off-hand? I am sure I could find it posted in here but busy busy busy! Thanks!
Factory 123 SST Velocity 20" Barrel?
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When I chrono'd one of your 20" AR740's, it was 2602fps with factory Hornady 123gr SST. I put the chrono 15ft away from the muzzle like the distractions say, not right up to or even 10ft from the muzzle. Not sure what others are getting.
It's in the mid-2400's from my 16" barrel.NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
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Altitude and external pressure isn't going to matter for muzzle velocity. The cartridge and barrel would produce the same speeds on the moon at the muzzle. It's a contained pressure vessel, with only temperature affecting mv to a degree.NRA Basic, Pistol, Rifle, Shotgun, RSO
CCW, CQM, DM, Long Range Rifle Instructor
6.5 Grendel Reloading Handbooks & chamber brushes can be found here:
www.AR15buildbox.com
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Originally posted by Adam Lilja View PostThanks guys! Paul why is yours so much higher than everyones ? Cory, I see around 100 fps difference in six of your shots at 77 degrees, is that from your barrel heating up? All of your others seem pretty consistent.
I want that damn Doppler Chrono!!!"Those who sacrifice liberty for security, deserve neither." Benjamin Franklin
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