|
Forum Rules | Firearms Safety | Firearms Photos | Links | Library | Lost Password | Email Changes |
Register | FAQ | Calendar | Search | Today's Posts | Mark Forums Read |
|
Thread Tools | Search this Thread |
October 9, 2014, 05:33 PM | #1 |
Senior Member
Join Date: June 17, 2010
Location: Virginia
Posts: 6,869
|
Garand [expletive deleted] :-)
OK....
http://imgur.com/a/3kabN > M1 Garand at 1200 > frames per second ( ...just when you though it was safe to go back into the water, compared against the AR action) |
October 9, 2014, 06:06 PM | #2 |
Senior Member
Join Date: April 18, 2014
Location: North Carolina
Posts: 2,320
|
Wow! I'd like to see some like these for the M1 Carbine!
__________________
Proud owner of three (four-ish) pieces of history! K-31, Mosin-Nagant M91/30, M24/47 Mauser, Norinco SKS. "You might as well appeal against a thunderstorm..." William Tecumseh Sherman |
October 9, 2014, 06:13 PM | #3 |
Member
Join Date: December 24, 2012
Posts: 63
|
Yep, I Likes my M1...
+ so far my method has left my thumb in tact... My Pop is smiling down on me and at the same time smacking the back of my head saying not to waste ammo!! |
October 10, 2014, 06:33 AM | #4 |
Senior Member
Join Date: February 15, 2009
Posts: 8,927
|
The unlocking cycle of the M1 Garand and M14 rifles was tested in 1957 by Springfield Armory. The purpose of the test was to determine the average time (in milliseconds) from firing pin contact to:
a. Bullet passing the gas port b. Bullet exit c. Initiation of operating rod recoil d. End of operating rod dwell e. Completion of bolt unlocking f. Position of bullet at initiation of operating rod recoil g. Position of bullet at end of operating rod dwell h. Position of bullet at completion of bolt unlocking Three single rounds were fired from each of three M1 and three M14 (T44E4) rifles. The ammunition used was M2 AP for the M1 rifles and armor piercing (T93E1 or T93E2) cartridges for the M14 rifles. Each rifle was fully loaded for each series of three shots. High speed motion picture cameras (operating at 6,000 to 7,000 frames per second; about 1 frame every .015 millisecond) and flash strobes were used to record hammer fall, bullet exit, operating rod movement and bolt unlocking during each firing sequence. Lumiline screens were used to record average bullet velocity at a distance of 53 feet forward of the muzzle. The film was analyzed to obtain the data below. Average values were computed from the high speed film as follows: Data Item ........................................................M1 Rifle ..............................M14 Rifle Type of gas system ...........................................gas impingement ...................gas cut-off and expansion Location of gas port from muzzle .........................1.5 “ ...................................8.0 “ Gas port diameter .............................................0.0793 “ ..............................0.0768 “ Barrel length ....................................................24 “ ....................................22 “ End of hammer fall ............................................0 milliseconds ........................0 milliseconds Bullet passes gas port .......................................1.31 milliseconds ...................1.01 milliseconds Bullet clears muzzle ...........................................1.36 milliseconds ...................1.25 milliseconds Initiation of operating rod recoil ...........................1.58 milliseconds ...................1.53 milliseconds End of operating rod dwell ...................................2.89 milliseconds ..................3.57 milliseconds Completion of bolt unlocking ................................4.07 milliseconds ..................5.00 milliseconds Amount of bullet travel at start of op rod recoil .......7.2 “ past the muzzle .............9.2 “ past the muzzle Position of bullet at end of op rod dwell .................50.2 “ past the muzzle ..........76.1 “ past the muzzle Position of bullet at completion of bolt unlocking ......88.9 “ past the muzzle .........123.0 “ past the muzzle Average bullet velocity ........................................2735 feet per second ...........2733 feet per second Reference: Springfield Armory Technical Note SA-TN11-1094 dated 16 Dec 1957 With both service rifles, it was common for competitive shooters to cut a turn or two off the ejector spring. Sometimes, ejector springs were so strong and the timing cycle was such that empty cases would be spun backwards over the rear sight going under the bill of their ball cap then bouncing off shooter's forehead. Very hot fired cases would often come to rest on the shooter's glasses' bridge against their forehead burning the skin (happened to me; twice). By cutting half a turn off at a time then testing ejected cases' trajectory, fired cases would be pushed forward and to the right piling up a couple feet away from the rifleman. Last edited by Bart B.; October 10, 2014 at 06:49 AM. |
October 10, 2014, 07:07 AM | #5 |
Member
Join Date: July 3, 2013
Location: Atascocita, TX
Posts: 78
|
This is awesome! Thanks so much for sharing this!
__________________
-Nathan- Remington 1911R1 .45ACP ~ Remington 870 Express SuperMag 12G ~ Smith & Wesson 629 Classic DX .44 Mag ~ Parker-Hale Model 1200 .30-06 CMP M1 Garand Special .30-06 ~ Tula '39 Mosin-Nagant M91/30 7.62x54R ~ Romanian M1969 Trainer .22LR |
October 10, 2014, 07:21 AM | #6 |
Senior Member
Join Date: November 15, 2006
Location: Home of the first First Lady
Posts: 463
|
PING!!
__________________
NRA Endowment Life Member Proud Son of a former Tomb Guard |
October 10, 2014, 09:06 AM | #7 |
Senior Member
Join Date: June 1, 2013
Location: Now relocated to Texas
Posts: 2,943
|
Wow! That is information on the M1 that I will never need in this lifetime
|
October 10, 2014, 09:37 AM | #8 |
Staff
Join Date: November 2, 1998
Location: Colorado
Posts: 21,824
|
Thanks. I saw the link the other day at another website and couldn't get it to run. Now it does.
__________________
Vigilantibus et non dormientibus jura subveniunt. Molon Labe! |
October 10, 2014, 10:48 PM | #9 |
Senior Member
Join Date: September 12, 2002
Location: Twin Cities, MN
Posts: 5,289
|
+1 on the thanks. It's a very interesting video.
|
October 11, 2014, 08:30 PM | #10 |
Senior Member
Join Date: May 29, 2007
Location: St. Louis, MO area
Posts: 4,040
|
Cool stuff. Thanks.
I know and love the AR, but darn if there isn't something about the Garand that just feels *right*. |
October 11, 2014, 09:01 PM | #11 |
Senior Member
Join Date: April 24, 2013
Location: Utah
Posts: 365
|
Pretty dang sweet! I love firearm technology, old stuff, new stuff - it's all awesome!
__________________
"Hokey religions and ancient weapons are no match for a good blaster at your side, kid." - Han Solo |
October 13, 2014, 02:29 AM | #12 |
Senior Member
Join Date: October 9, 2009
Location: North Alabama
Posts: 8,273
|
thanks
Neat video, thanks.
Bart B. What a bunch of data!!! And the conclusion?? |
October 16, 2014, 08:54 PM | #13 |
Senior Member
Join Date: January 26, 2007
Location: Forest Lake, Minnesota
Posts: 307
|
Another big thank you.
Makes me appreciate my Garand even more, now. Eric
__________________
NRA Chief Range Safety Officer NRA Pistol Instructor NRA Life Member DNR Certified Firearms Safety Instructor 37 yrs |
October 23, 2014, 07:15 PM | #14 |
Senior Member
Join Date: February 15, 2009
Posts: 8,927
|
I draw no conclusions. I'm just the messenger.
It may explain to some why Garands could be rebuilt and be almost as accurate as bolt action rifles. None of their parts move until the bullet is out of the barrel. If all parts are in battery exactly the same for each shot fired, the barrel whips and wiggles the same way while the bullets go through it. Last edited by Bart B.; October 23, 2014 at 07:20 PM. |
Thread Tools | Search this Thread |
|
|