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Joined: Nov 2007
Posts: 47,254 Likes: 13
Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2007
Posts: 47,254 Likes: 13 |
God bless Texas-----------------------
Old 300
I will remain what i am until the day I die- A HUNTER......Sitting Bull
Its not how you pick the booger..
but where you put it !!
Roger V Hunter
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Joined: Jun 2013
Posts: 227
Campfire Member
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OP
Campfire Member
Joined: Jun 2013
Posts: 227 |
I wouldn't think a 270 AR would exactly be anemic at 600 yards. 140 AB, 20" bbl, BL-C2, 59K psi, 2600 fps.
Tabular trajectory data at Non-Std. Atmosphere
Gunsite altitude : 4500 ft.
Air density : 0.061325 lb./ft�
-------------------------------------------------------------------------------------
Gun / Ammunition : .30 Rem AR, edited to 270 AR
Bullet : .277, 140, Nosler AccuBond 54765
Bullet weight : 140 grains or 9.07 Grams
Muzzle velocity : 2603 fps
Crosswind speed : 10 Mph
Ballistic Coefficient(s) (G1):
C1=0.496@V>0 fps;
Range Velo Time of Energy Path Deflection Total Sight correction Target
city flight to at crosswind drop for setting new lead
LOS of 10.0 Mph zero range 20 fps
-------------------------------------------------------------------------------------
�Yards fps s ft.lbs. in. in. MOA in. Clicks MOA yds �
-------------------------------------------------------------------------------------
| 0 2603 0.0000 2106 -2.0 0.0 ----- 0.0 ------ ----- 0.00
| 100 2463 0.1184 1885 +1.8 0.5 0.52 2.7 -5.1 -1.76 0.79
M 120 2435 0.1425 1843 +2.0 0.7 0.59 3.8 -4.5 -1.56 0.95
X 200 2327 0.2428 1682 0.0 2.2 1.04 11.0 0.0 0.00 1.62
P 246 2266 0.3031 1595 -3.0 3.4 1.34 16.9 +3.4 +1.16 2.02
| 300 2195 0.3761 1498 -8.4 5.3 1.70 25.8 +7.8 +2.67 2.51
| 400 2068 0.5173 1329 -24.0 9.9 2.37 47.9 +16.7 +5.73 3.45
| 500 1945 0.6655 1175 -47.4 15.7 3.00 77.8 +26.3 +9.05 4.44
| 600 1825 0.8238 1035 -79.9 23.3 3.70 116.8 +37.0 +12.72 5.49
Are you saying it is or its not?
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Joined: Nov 2011
Posts: 31,104 Likes: 5
Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2011
Posts: 31,104 Likes: 5 |
To some of us it's pretty anemic. Your 400 yard energy is my 1000 yard energy Trajectory
Input Data
Manufacturer: Nosler Description: Accubond� Spitzer
Caliber: 0.284 in Weight: 160.0 gr
Ballistic Coefficient: 0.531 G1 (ASM)
Muzzle Velocity: 3475.0 ft/s Distance to Chronograph: 10.0 ft
Sight Height: 1.50 in Sight Offset: 0.00 in
Zero Height: 0.00 in Zero Offset: 0.00 in
Windage: 0.000 MOA Elevation: 0.000 MOA
Line Of Sight Angle: 0.0 deg Cant Angle: 0.0 deg
Wind Speed: 10.0 mph Wind Angle: 90.0 deg
Target Speed: 10.0 mph Target Angle: 90.0 deg
Target Height: 12.0 in
Temperature: 40.2 �F Pressure: 24.64 in Hg
Humidity: 0 % Altitude: 5280.0 ft
Vital Zone Radius: 5.0 in
Std. Atmosphere at Altitude: Yes Pressure is Corrected: Yes
Zero at Max. Point Blank Range: No Target Relative Drops: Yes
Mark Sound Barrier Crossing: No Include Extra Rows: No
Column 1 Units: 1.00 in Column 2 Units: 1.00 MOA
Round Output to Whole Numbers: No
Output Data
Elevation: 2.850 MOA Windage: 0.000 MOA
Atmospheric Density: 0.06534 lb/ft� Speed of Sound: 1096.0 ft/s
Maximum PBR: 426 yd Maximum PBR Zero: 362 yd
Range of Maximum Height: 199 yd Energy at Maximum PBR: 2732.0 ft�lbs
Sectional Density: 0.283 lb/in�
Calculated Table
Range Drop Drop Windage Windage Velocity Mach Energy Time Lead Lead
(yd) (in) (MOA) (in) (MOA) (ft/s) (none) (ft�lbs) (s) (in) (MOA)
0 -1.5 *** 0.0 *** 3481.0 3.176 4304.3 0.000 0.0 ***
100 -0.0 -0.0 0.4 0.4 3303.5 3.014 3876.5 0.088 15.6 14.9
200 -1.7 -0.8 1.6 0.8 3133.5 2.859 3487.8 0.182 32.0 15.3
300 -6.9 -2.2 3.8 1.2 2970.3 2.710 3133.9 0.280 49.3 15.7
400 -16.1 -3.8 6.9 1.6 2813.2 2.567 2811.2 0.384 67.6 16.1
500 -29.7 -5.7 11.0 2.1 2661.8 2.429 2516.7 0.493 86.9 16.6
600 -48.1 -7.7 16.3 2.6 2515.5 2.295 2247.6 0.609 107.3 17.1
700 -72.1 -9.8 22.7 3.1 2373.9 2.166 2001.8 0.732 128.9 17.6
800 -102.3 -12.2 30.4 3.6 2237.0 2.041 1777.5 0.862 151.8 18.1
900 -139.4 -14.8 39.6 4.2 2104.4 1.920 1573.1 1.001 176.1 18.7
1000 -184.3 -17.6 50.3 4.8 1976.4 1.803 1387.6 1.148 202.0 19.3
Last edited by antelope_sniper; 07/17/13.
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
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Joined: Jun 2013
Posts: 227
Campfire Member
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OP
Campfire Member
Joined: Jun 2013
Posts: 227 |
To some of us it's pretty anemic. Your 400 yard energy is my 1000 yard energy Trajectory
Input Data
Manufacturer: Nosler Description: Accubond� Spitzer
Caliber: 0.284 in Weight: 160.0 gr
Ballistic Coefficient: 0.531 G1 (ASM)
Muzzle Velocity: 3475.0 ft/s Distance to Chronograph: 10.0 ft
Sight Height: 1.50 in Sight Offset: 0.00 in
Zero Height: 0.00 in Zero Offset: 0.00 in
Windage: 0.000 MOA Elevation: 0.000 MOA
Line Of Sight Angle: 0.0 deg Cant Angle: 0.0 deg
Wind Speed: 10.0 mph Wind Angle: 90.0 deg
Target Speed: 10.0 mph Target Angle: 90.0 deg
Target Height: 12.0 in
Temperature: 40.2 �F Pressure: 24.64 in Hg
Humidity: 0 % Altitude: 5280.0 ft
Vital Zone Radius: 5.0 in
Std. Atmosphere at Altitude: Yes Pressure is Corrected: Yes
Zero at Max. Point Blank Range: No Target Relative Drops: Yes
Mark Sound Barrier Crossing: No Include Extra Rows: No
Column 1 Units: 1.00 in Column 2 Units: 1.00 MOA
Round Output to Whole Numbers: No
Output Data
Elevation: 2.850 MOA Windage: 0.000 MOA
Atmospheric Density: 0.06534 lb/ft� Speed of Sound: 1096.0 ft/s
Maximum PBR: 426 yd Maximum PBR Zero: 362 yd
Range of Maximum Height: 199 yd Energy at Maximum PBR: 2732.0 ft�lbs
Sectional Density: 0.283 lb/in�
Calculated Table
Range Drop Drop Windage Windage Velocity Mach Energy Time Lead Lead
(yd) (in) (MOA) (in) (MOA) (ft/s) (none) (ft�lbs) (s) (in) (MOA)
0 -1.5 *** 0.0 *** 3481.0 3.176 4304.3 0.000 0.0 ***
100 -0.0 -0.0 0.4 0.4 3303.5 3.014 3876.5 0.088 15.6 14.9
200 -1.7 -0.8 1.6 0.8 3133.5 2.859 3487.8 0.182 32.0 15.3
300 -6.9 -2.2 3.8 1.2 2970.3 2.710 3133.9 0.280 49.3 15.7
400 -16.1 -3.8 6.9 1.6 2813.2 2.567 2811.2 0.384 67.6 16.1
500 -29.7 -5.7 11.0 2.1 2661.8 2.429 2516.7 0.493 86.9 16.6
600 -48.1 -7.7 16.3 2.6 2515.5 2.295 2247.6 0.609 107.3 17.1
700 -72.1 -9.8 22.7 3.1 2373.9 2.166 2001.8 0.732 128.9 17.6
800 -102.3 -12.2 30.4 3.6 2237.0 2.041 1777.5 0.862 151.8 18.1
900 -139.4 -14.8 39.6 4.2 2104.4 1.920 1573.1 1.001 176.1 18.7
1000 -184.3 -17.6 50.3 4.8 1976.4 1.803 1387.6 1.148 202.0 19.3
We shall see i'm hoping his measurements are on target
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Joined: Sep 2001
Posts: 19,093 Likes: 5
Campfire Ranger
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Campfire Ranger
Joined: Sep 2001
Posts: 19,093 Likes: 5 |
I wouldn't think a 270 AR would exactly be anemic at 600 yards. 140 AB, 20" bbl, BL-C2, 59K psi, 2600 fps.
Tabular trajectory data at Non-Std. Atmosphere
Gunsite altitude : 4500 ft.
Air density : 0.061325 lb./ft�
-------------------------------------------------------------------------------------
Gun / Ammunition : .30 Rem AR, edited to 270 AR
Bullet : .277, 140, Nosler AccuBond 54765
Bullet weight : 140 grains or 9.07 Grams
Muzzle velocity : 2603 fps
Crosswind speed : 10 Mph
Ballistic Coefficient(s) (G1):
C1=0.496@V>0 fps;
Range Velo Time of Energy Path Deflection Total Sight correction Target
city flight to at crosswind drop for setting new lead
LOS of 10.0 Mph zero range 20 fps
-------------------------------------------------------------------------------------
�Yards fps s ft.lbs. in. in. MOA in. Clicks MOA yds �
-------------------------------------------------------------------------------------
| 0 2603 0.0000 2106 -2.0 0.0 ----- 0.0 ------ ----- 0.00
| 100 2463 0.1184 1885 +1.8 0.5 0.52 2.7 -5.1 -1.76 0.79
M 120 2435 0.1425 1843 +2.0 0.7 0.59 3.8 -4.5 -1.56 0.95
X 200 2327 0.2428 1682 0.0 2.2 1.04 11.0 0.0 0.00 1.62
P 246 2266 0.3031 1595 -3.0 3.4 1.34 16.9 +3.4 +1.16 2.02
| 300 2195 0.3761 1498 -8.4 5.3 1.70 25.8 +7.8 +2.67 2.51
| 400 2068 0.5173 1329 -24.0 9.9 2.37 47.9 +16.7 +5.73 3.45
| 500 1945 0.6655 1175 -47.4 15.7 3.00 77.8 +26.3 +9.05 4.44
| 600 1825 0.8238 1035 -79.9 23.3 3.70 116.8 +37.0 +12.72 5.49
Are you saying it is or its not? I'm saying it looks like it should be able to deliver very useful terminal ballistics at 600, from a 20" bbl, without red-lining pressure.
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Joined: Jun 2013
Posts: 227
Campfire Member
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OP
Campfire Member
Joined: Jun 2013
Posts: 227 |
I wouldn't think a 270 AR would exactly be anemic at 600 yards. 140 AB, 20" bbl, BL-C2, 59K psi, 2600 fps.
Tabular trajectory data at Non-Std. Atmosphere
Gunsite altitude : 4500 ft.
Air density : 0.061325 lb./ft�
-------------------------------------------------------------------------------------
Gun / Ammunition : .30 Rem AR, edited to 270 AR
Bullet : .277, 140, Nosler AccuBond 54765
Bullet weight : 140 grains or 9.07 Grams
Muzzle velocity : 2603 fps
Crosswind speed : 10 Mph
Ballistic Coefficient(s) (G1):
C1=0.496@V>0 fps;
Range Velo Time of Energy Path Deflection Total Sight correction Target
city flight to at crosswind drop for setting new lead
LOS of 10.0 Mph zero range 20 fps
-------------------------------------------------------------------------------------
�Yards fps s ft.lbs. in. in. MOA in. Clicks MOA yds �
-------------------------------------------------------------------------------------
| 0 2603 0.0000 2106 -2.0 0.0 ----- 0.0 ------ ----- 0.00
| 100 2463 0.1184 1885 +1.8 0.5 0.52 2.7 -5.1 -1.76 0.79
M 120 2435 0.1425 1843 +2.0 0.7 0.59 3.8 -4.5 -1.56 0.95
X 200 2327 0.2428 1682 0.0 2.2 1.04 11.0 0.0 0.00 1.62
P 246 2266 0.3031 1595 -3.0 3.4 1.34 16.9 +3.4 +1.16 2.02
| 300 2195 0.3761 1498 -8.4 5.3 1.70 25.8 +7.8 +2.67 2.51
| 400 2068 0.5173 1329 -24.0 9.9 2.37 47.9 +16.7 +5.73 3.45
| 500 1945 0.6655 1175 -47.4 15.7 3.00 77.8 +26.3 +9.05 4.44
| 600 1825 0.8238 1035 -79.9 23.3 3.70 116.8 +37.0 +12.72 5.49
Are you saying it is or its not? I'm saying it looks like it should be able to deliver very useful terminal ballistics at 600, from a 20" bbl, without red-lining pressure. If his barrels are faster than QL predicts? Can you in put COL and barrel threading? I need to get a copy of this software!!
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Joined: Nov 2011
Posts: 31,104 Likes: 5
Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2011
Posts: 31,104 Likes: 5 |
Actually, it does look pretty interesting, especially with all the .277 stuff I already have.
As someone else already mentioned, I would be more inclined toward the 110gr NAB's and see what I could do those at reasonable pressures.
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
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Joined: Feb 2010
Posts: 1,717
Campfire Regular
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Campfire Regular
Joined: Feb 2010
Posts: 1,717 |
I'd still love to pull up beside the feller plinking away with this little anemic prick and wail a 140 TTSX by way of a 7-08 R25 across a 600 yard stretch and biitch slap the gong at the other end. Ya'd have to wait till I was otu of ammo for my 223 so the gong would quit moving with each hit though. But I'd humor ya at the end of a mag. Never once said the 223 couldn't get schit done. My point was if you want more stomp than a 22 CF can deliver, bump up to a 6mm/7mm and leave the bastard child 27AR on the shelf to collect dust.
If I were smart enough, which apparently I'm not
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Joined: Sep 2001
Posts: 19,093 Likes: 5
Campfire Ranger
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Campfire Ranger
Joined: Sep 2001
Posts: 19,093 Likes: 5 |
In the QL calcs, pushing up from 60K to 65K only seems to net about 50 fps at the muzzle. That difference only shrinks downrange.
Don't get too tied to the QL calcs anyway. They are only predictions. with all the variables out there, they are only ballpark predictors.
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Joined: Jun 2013
Posts: 227
Campfire Member
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OP
Campfire Member
Joined: Jun 2013
Posts: 227 |
Its kind of curious the number of people pretending to not be interested in the 270AR but can't stop commenting on this thread. Also the evenings seem to be more productive when the slacker trolls aren't on here. I think theirs a group of trolls paid to disrupt threads discussing the topic of hunting with AR's. the same group have many different names on multiple forums.
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Joined: Jan 2010
Posts: 8,423
Campfire Outfitter
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Campfire Outfitter
Joined: Jan 2010
Posts: 8,423 |
Who's going to make the ammo every company around just wants to make 308 (7.62) and 223 (5.56) sounds cool but its hard to believe there will be a reliable source of ammo tell all the [bleep] blows over on the political field
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Joined: Sep 2001
Posts: 19,093 Likes: 5
Campfire Ranger
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Campfire Ranger
Joined: Sep 2001
Posts: 19,093 Likes: 5 |
That's just it. Rem introduced the 30 AR not so long ago, it seems to be stillborn.
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Joined: Jun 2013
Posts: 227
Campfire Member
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OP
Campfire Member
Joined: Jun 2013
Posts: 227 |
That's just it. Rem introduced the 30 AR not so long ago, it seems to be stillborn.
They are back in stock and still produced unlike the internet forums rumors saying they stopped production. You can get one right now for 1030.
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Joined: Jan 2013
Posts: 3,081
Campfire Tracker
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Campfire Tracker
Joined: Jan 2013
Posts: 3,081 |
Looks like a 30ar necked down to 270.
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Joined: Jun 2013
Posts: 227
Campfire Member
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OP
Campfire Member
Joined: Jun 2013
Posts: 227 |
Who's going to make the ammo every company around just wants to make 308 (7.62) and 223 (5.56) sounds cool but its hard to believe there will be a reliable source of ammo tell all the [bleep] blows over on the political field You have to load your own no ones going to make ammo. That's understood going in. This isn't for the walmart crowd.
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Joined: Jun 2005
Posts: 27,500
Campfire Ranger
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Campfire Ranger
Joined: Jun 2005
Posts: 27,500 |
Its kind of curious the number of people pretending to not be interested in the 270AR but can't stop commenting on this thread. Also the evenings seem to be more productive when the slacker trolls aren't on here. I think theirs a group of trolls paid to disrupt threads discussing the topic of hunting with AR's. the same group have many different names on multiple forums. Now this is just FASCINATING! I guy who joined all of 33 days ago and has 118 posts, calling some of us trolls. Wow, I only have one name, and only belong to this forum as it relates to firearms. Also an infrequent poster at the Harley Sporster XL forum, but that is it. No computer nerd here. Just pointing out some rather obvious absurdities. And as I stated I LOVE wildcats and AR's. Have had more than a few of both and hope to have more of both. fast twist 22/6mmAI is calling my name... As is a 264STW 
LOVE God, LOVE your family, LOVE your country, LIKE guns and sports.
About 2016 team "R" candidates "We definitely need a crew with a sack of balls the size of hot water bottles, bloviated estrogen leaking feel-gooders need not apply." Gunner 500
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Joined: Jun 2013
Posts: 227
Campfire Member
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OP
Campfire Member
Joined: Jun 2013
Posts: 227 |
Its kind of curious the number of people pretending to not be interested in the 270AR but can't stop commenting on this thread. Also the evenings seem to be more productive when the slacker trolls aren't on here. I think theirs a group of trolls paid to disrupt threads discussing the topic of hunting with AR's. the same group have many different names on multiple forums. Now this is just FASCINATING! I guy who joined all of 33 days ago and has 118 posts, calling some of us trolls. Wow, I only have one name, and only belong to this forum as it relates to firearms. Also an infrequent poster at the Harley Sporster XL forum, but that is it. No computer nerd here. Just pointing out some rather obvious absurdities. And as I stated I LOVE wildcats and AR's. Have had more than a few of both and hope to have more of both. fast twist 22/6mmAI is calling my name... As is a 264STW I didn't mention you feeling guilty?
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Joined: Jan 2005
Posts: 53,303
Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2005
Posts: 53,303 |
If his barrels are faster than QL predicts? Can you in put COL and barrel threading? I need to get a copy of this software!! Are you talking about TWIST rate.....? All through this (initially) interesting thread you've from time to time used some just flat out STRANGE terms. Let them ride, ARE you talking about twist rate ? If not, what EARTHLY effect would shank thread specs have on pressures ? FIW,.....You're getting a little off the wall with your "Troll" allegations, Bud. ....clean up yer' act, please. GTC
Last edited by crossfireoops; 07/17/13.
Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain
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Joined: Jan 2005
Posts: 53,303
Campfire Kahuna
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Campfire Kahuna
Joined: Jan 2005
Posts: 53,303 |
Ballistics are controlled by physics and are pretty predictable as long as you know the barrel velocity, grain size and BC of the bullet you know its flight path in perfect conditions of course. Is that supposed to mean MUZZLE VELOCITY ? No offense, Bud,....is English your first language ? "grain size" v WEIGHT ? Your whole rap is stilted and studded with odd, and somewhat unusual vernacular. GOOD GRIEF,......tell me you're not Vladimir Putin just [bleep]' around on the net between hunting trips. GTC
Member, Clan of the Border Rats
-- “Sometimes I wonder whether the world is being run by smart people who are putting us on or by imbeciles who really mean it.”- Mark Twain
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Joined: Jun 2005
Posts: 27,500
Campfire Ranger
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Campfire Ranger
Joined: Jun 2005
Posts: 27,500 |
Ballistics are controlled by physics and are pretty predictable as long as you know the barrel velocity, grain size and BC of the bullet you know its flight path in perfect conditions of course. Is that supposed to mean MUZZLE VELOCITY ? No offense, Bud,....is English your first language ? "grain size" v WEIGHT ? Your whole rap is stilted and studded with odd, and somewhat unusual vernacular. GOOD GRIEF,......tell me you're not Vladimir Putin just [bleep]' around on the net between hunting trips. GTC Maybe he is referring to the velocity of the barrel when it blows off of the receiver and heads downrange after too many loads running pressures well above the 60K upper limit for us mere mortals. I suspect that such a barrel might be movin pretty quickly. With the right shank threads, perhaps the barrel can become a reasonably accurate projectile. NOW we have an interesting rifle concept!
LOVE God, LOVE your family, LOVE your country, LIKE guns and sports.
About 2016 team "R" candidates "We definitely need a crew with a sack of balls the size of hot water bottles, bloviated estrogen leaking feel-gooders need not apply." Gunner 500
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