Are all 147gr 9mm (9x19) loads considered subsonic?
Are all 147gr 9mm (9x19) loads considered subsonic?
I would expect them all to be yes. Even at +P they shouldn't be anywhere near 1100.
~Nemo me impune lacessit~
Out of a pistol length barrel, they should stay subsonic.
Yes by and large they would be even in an Uzi.
1129.3...3 at 70F and at sea level.Originally Posted by O.S.O.K.
770 mph X 5280 feet per mile = 4,065,600 ft. per hour. Divided by 60 = 767760 feet per minute, divided by 60 = 1129.3333 feet per second.
The exception. It must be loaded extremely hot!
http://www.buffalobore.com/index.php...t_detail&p=120
Steve
After today, it's all historical.
Math just got pimp slapped by reality.....(nah my load isn't that stuff)
Last edited by mriddick; 02-20-2011 at 10:24 PM.
Huh- I bet that would hit more than 1300 FPS out of my sub 2000. Nice.
My ammo gives me 1020 fps out of a Browning but it's the most accurate of all the 9 MM. My 110 and 124 stuff is practice ammo and the 147 is for serious, velocity be damned. Getting a hit counts for more than the little bullet going real fast in my dinosaur philosophy. Must be why I am a 1911 45 caliber ACP fan. You take the Ferrari, I'll take the Big Mack truck.
Roman Catholic, Life Member of American Legion, VFW, Wisconsin Libertarian party, Wi-FORCE, WGO, NRA, JPFO, GOA, SAF and CCRKBA
"THE STATE THAT SEPARATES ITS SCHOLARS FROM IT WARRIORS WILL HAVE ITS THINKING DONE BY COWARDS AND ITS FIGHTING DONE BY FOOLS"
THUCYDIDES.
Gotta figure varience - 30 fps would be normal in many loads.
~Nemo me impune lacessit~
FWIW, I could never get my Trident 9 suppressor to cycle my G17 until I tried some ammo from "Alabama Ammo" and the specific 147gr is called "Special K".
Is 770mph a constant or does it vary with altitude/ barometric pressure/ temp?
I will take an order for the Big Mack truck.
I am sitting in my angry chair!
Everything varies with altitude, barometric pressure and temp.
While no one ever listens to me,
I am constantly being told to be quiet.
In a world of snowflakes,
be the heat..
Sounds like a job for MythBusters!!!
"The God who gave us life, gave us liberty at the same time; the hand of force may destroy, but cannot disjoin them. ... Can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God? That they are not to be violated but with His wrath? Indeed I tremble for my country when I reflect that God is just: that his justice cannot sleep for ever."--Thomas Jefferson
How about I wait till it gets alittle warmer and I'll just get out the chrono...
But do you have a hot assistant like Carrie from Mythbusters?
"The God who gave us life, gave us liberty at the same time; the hand of force may destroy, but cannot disjoin them. ... Can the liberties of a nation be thought secure when we have removed their only firm basis, a conviction in the minds of the people that these liberties are the gift of God? That they are not to be violated but with His wrath? Indeed I tremble for my country when I reflect that God is just: that his justice cannot sleep for ever."--Thomas Jefferson
Hot nerd assistants aside, mythbusters kinda sucks. They don't seem very scientific.
I roll my own for use with the suppressor and believe it's under 1000fps.
I have a hard time with 147gr bullets going supersonic, but I am shooting at anywhere between 4500 feet and 10,000 feet above sea level. The problem is even worse in the summer when it is HOT.
Posting Permissions
Reply With Quote
Bookmarks