Muzzle velocity to remain super sonic at 1000 yards

Bill Daniel · February 25, 2016, 05:52 PM

What muzzle velocity is needed to keep a 0.308" 175 grain SMK super sonic at 1000 yards, elevation 2300 ft above sea level.
Thanks,
Bill

**Unclenick** · February 25, 2016, 06:12 PM

Using the BRL drag function for that bullet, under ICAO standard conditions for that altitude (27.52 in Hg, 50.8°F, 0% RH), for which the speed of sound is 1108 fps, it takes 2461 fps to just hit the speed of sound at 1000 yards, so anything over that should be good.

Bill Daniel · February 25, 2016, 06:45 PM

Thanks Unclenick!
Bill

February 25, 2016, 05:52 PM	#1
Bill Daniel Senior Member Join Date: February 10, 2000 Location: Bowling Green, KY. Posts: 518	Muzzle velocity to remain super sonic at 1000 yards What muzzle velocity is needed to keep a 0.308" 175 grain SMK super sonic at 1000 yards, elevation 2300 ft above sea level. Thanks, Bill

February 25, 2016, 06:12 PM	#2
Unclenick Staff Join Date: March 4, 2005 Location: Ohio Posts: 21,119	Using the BRL drag function for that bullet, under ICAO standard conditions for that altitude (27.52 in Hg, 50.8°F, 0% RH), for which the speed of sound is 1108 fps, it takes 2461 fps to just hit the speed of sound at 1000 yards, so anything over that should be good. __________________ Gunsite Orange Hat Family Member CMP Certified GSM Master Instructor NRA Certified Rifle Instructor NRA Benefactor Member and Golden Eagle

February 25, 2016, 06:45 PM	#3
Bill Daniel Senior Member Join Date: February 10, 2000 Location: Bowling Green, KY. Posts: 518	Muzzle velocity Thanks Unclenick! Bill