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Posted: 7/5/2005 8:52:57 PM EDT
can you pls. help me locate sites where there is available data re: .50 trajectory...(external ballistics of .50 etc..) thank you
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2.3" sight over bore 1000' density altitude Here are two typical loads:
Give me the bullet, MV, and environmental conditions and I can get more specific data. |
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6.8SPC FAQ & Load Data- http://demigod.org/68faq
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6.8SPC FAQ & Load Data- http://demigod.org/68faq
Precision Rifle Field Match in Raton- http://demigod.org/srm
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The latest issue of VHP has a bunch of tables listed, go to the FCSA website to get the info on ordering it and becoming a member. www.fcsa.org |
It will be close to the M33 data above. Like I said, give me a MV, BC, and environmental conditions and I'll get another table... |
How many scored rounds have you fired this month? Email me for Colorado 3Gun info.
6.8SPC FAQ & Load Data- http://demigod.org/68faq
Precision Rifle Field Match in Raton- http://demigod.org/srm
6.8SPC FAQ & Load Data- http://demigod.org/68faq
Precision Rifle Field Match in Raton- http://demigod.org/srm
| Modern Ballistics has 50 BMG as a default cartiridge. |
http://blog.ryjones.org/
| I have a barrett 82, shoot mainly surplus/reloaded 690g ap ammo. My scope has a bdc, but the first setting is at 300 yds, where it is supposed to be sighted in. I currently have access only to a 100 and 200 yd range, any idea where my bullets should hit at these distances to be matched zero at 300? |
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If the sight over bore distance is 2.6" (check?), then sight in ABOUT 4" HIGH at 200 yards, using the 300 yard stadia line. (At 100, it would be ABOUT 3" HIGH). This should put you "on" at 300 using the 300 yard line. |
ColoradoMultigun.com
Come shoot our Practical Rifle Team Challenge (PRTC), 11-13 AUG 2006
Precision Rifle Field Match in Raton- http://demigod.org/srm
Come shoot our Practical Rifle Team Challenge (PRTC), 11-13 AUG 2006
Precision Rifle Field Match in Raton- http://demigod.org/srm
Not to doubt you but are you sure that BC is correct? It seems awfully high to me. Thanks! 
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"The world is full of stupid people" The Refreshments, Banditos.
I'll work on that, since I have a CQ and have access to a 107. |
If you are doubting the the BC for the AMAX 750 gr, then rest assure that I too looked it up a week ago and 1.05 is correct. As for the 647gr bullet. I do not know so I can not claim or disclaim that this number is correct.
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Depends upon a host of factors. I'm shooting Amax's out of a 30" barrel at around 2600 which produces around 11,000 foot pounds at the muzzle. At 1000 yards the bullet is traveling about 2000 fps with a retained energy of about 6500 foot pounds. Depending upon the load, you can get substantially higher than that. Some of the match shooters I know are pushing 800 grain solids at 2900 fps out of 33" barrels with VV20N29 producing a muzzle energy of around 15,000 foot pounds. Those guys are running right at max pressure so I wouldn't suggest that load for most folks. I think you'd be safe to say 50 BMG MV run between 2400 and 2900 fps with energies from 10,000 to 15,000 foot pounds at the muzzle. -David Edgewood, NM |
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Ballistic Coefficients of M33 647 ball is approx. .680 and API is .663. All you need to know is your velocity. Check out a couple of on-line free ballistic calculators such as: www.eskimo.com/~jbm/calculations/calculations.html Click on trajectory basic and plug in your data. Or download this free calculator: www.huntingnut.com/index.php?name=news&file=article&sid=3 This download is PointBlank Ballistic coefficient of a Hornady 750 A-Max is 1.050 |
Old Timer-Just Cause, Desert Storm, Restore Hope
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Couple of questions gentlemen,
Since they pertain directly to ballistics / trajectory I figured it would make sense to post them here, versus just starting another topic. Barrett M33 ZAK, you posted the weight of the M33 as 647 grains. I checked the Barrett website and they list the weight of their M33 as 661 grains. Did Barrett offer M33 with 2 different weight bullets, or did you just use the default Military Ball weight? I have some older Barrett that I pitched the boxes for because they were all torn up, and if they offered 2 different weights, then I am going to have to try and figure out which weight they are. Summit Does anyone have a velocity number for the Summit 690 grain Ball Ammo? There is no ballistic info on the ammo box, and the Summit website is down for improvements. All else fails, I will get on the phone Monday morning to Summit, but I am shooting this weekend, so it would be great if I could a number before Monday. I would assume it is somewhere between 2,600-2,800 fps, but that is a big velocity range to be working with at 1,000 yards, a 50 fps variation is good for 10"-12" at that distance. Surplus Military I have the following Weights and Ballistic Coefficients for Surplus Military Bullets, do they seem to be correct / what everyone is using? Ball 647 grain = 0.670 AP 708 grains = 0.650 Thanks, Capt Richardson |
"It takes a remarkable person not just to say a Creed and memorize a Creed, but to live by a Creed." S. Shughart
9-11-01 "All gave some, some gave all", Rest in Peace Brothers of FDNY
9-11-01 "All gave some, some gave all", Rest in Peace Brothers of FDNY
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Hi, I am getting a bullet drop of around 38 feet (465 inches) in the MBall and Sierra software using the following data: Magtech/CBC 656 gr, BC .364, Muzzle Velocity 2952. I got the numbers from Cabelas Magtech/CBC 50BMG
and Magtech.com A 38 ft drop seems awful extreme at 1000 yards. Does this mean this ammo is crap for long range? I have access to it at my local shop and at a very good price. It did shoot a sub 1 MOA group from 100 yds though? I havnt had a chance to get to a bigger range yet so I was messing around with the software trying to get an idea of what i would be dealing with. So does that calculation seem right? |
Old Timer-Just Cause, Desert Storm, Restore Hope
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Originally Posted By shadowskinner:
Hi, I am getting a bullet drop of around 38 feet (465 inches) in the MBall and Sierra software using the following data: Magtech/CBC 656 gr, BC .364, Muzzle Velocity 2952. I got the numbers from Cabelas Magtech/CBC 50BMG and Magtech.com A 38 ft drop seems awful extreme at 1000 yards. Does this mean this ammo is crap for long range? I have access to it at my local shop and at a very good price. It did shoot a sub 1 MOA group from 100 yds though? I havnt had a chance to get to a bigger range yet so I was messing around with the software trying to get an idea of what i would be dealing with. So does that calculation seem right? Those numbers seem to be pretty goofy, 
Ballistic Coefficient - BC of 0.364 seems to be way low, standard BC for Ball Ammo should be in the 0.650-0.670 range. Muzzle Velocity - 2,952 is a screaming velocity, HSM AMAXs run around 2,680, and Barrett Ball is around 2,750. The max I have ever seen anyone run is around 3,000 and that is considered to be hot. Standard numbers for "comparable" Ball Ammo: Barrett M33 Range Velocity Time Energy Drop MOA 0 2750 0 11098 0 0 1000 1500 1.48 3302 -351.4 +28.7 Weight = 661 gr / BC = 0.650 approx Makes me wonder how those numbers could be that far off the norm? 
May be worth a phone call to Cabelas or Magtech to see what is up? Best of Luck, Capt Richardson PS: IMHO, if you want to shoot long range accurately, don't waste your time with Ball Ammo. With AMAXs I can shoot 1-1.5 MOA, with Ball Ammo that doubles up to at least 3 MOA. |
"It takes a remarkable person not just to say a Creed and memorize a Creed, but to live by a Creed." S. Shughart
9-11-01 "All gave some, some gave all", Rest in Peace Brothers of FDNY
9-11-01 "All gave some, some gave all", Rest in Peace Brothers of FDNY
Old Timer-Just Cause, Desert Storm, Restore Hope
Joined:
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Originally Posted By MarianLibrarian:
off topic, are you the Captain Richardson that was in the 76SIB a couple of years ago? If so, I think your were my husband's PS. Sorry for the late reply, No I had left "Big Green" by 1994, so it would not have been me. Capt Richardson |
"It takes a remarkable person not just to say a Creed and memorize a Creed, but to live by a Creed." S. Shughart
9-11-01 "All gave some, some gave all", Rest in Peace Brothers of FDNY
9-11-01 "All gave some, some gave all", Rest in Peace Brothers of FDNY
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Thanks, I guess I just need to get my Chrony set up and see what the correct velocity is for this ammo. I"ve never used a Chronograph and I'm afraid of using it on the Ar50 first time out, don't want to blow it up
Also , yes I have some HSM Amax ammo as well but at $40/box vs $60/box I just wanted to practice with the cheap stuff first. I figured the Magtech CBC stuff for crap but after it shot these two groups (3 shot and 2 shot) from 120yds(I know goofy distance but it's as far as I have at home), I thought it may be some decent stuff. This was immediately after boresighting my new SS scope too. Only touched the knobs once after that first 2 shot group. 
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Originally Posted By shadowskinner:
Hi, I am getting a bullet drop of around 38 feet (465 inches) in the MBall and Sierra software using the following data: Magtech/CBC 656 gr, BC .364, Muzzle Velocity 2952. I got the numbers from Cabelas Magtech/CBC 50BMG and Magtech.com A 38 ft drop seems awful extreme at 1000 yards NO SHIT!. Does this mean this ammo is crap for long range? I have access to it at my local shop and at a very good price. It did shoot a sub 1 MOA group from 100 yds though? I havnt had a chance to get to a bigger range yet so I was messing around with the software trying to get an idea of what i would be dealing with. So does that calculation seem right? I think you missed a digit as I beleve a loaded mag from my M107 has around 130,000+or- energy blasting out of the full length barrell. Correct me if I'm wrong or misunderstanding something here. Oh and 38 ft does seem drastic, as I can see a RO freaking and yell to quit aiming for the jets.  Thanks.
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| A lot of folks here are running shorter barrels. I'm loading API behind 218 grs of AA8700 and out of the 24" Bohica it's giving me 2478 FPS. I can push it faster but the groups start to spread out. As it is at 100 yards I'm getting 5 shot 3 MOA with the API pulled and resized bullets. I'm looking forward to shooting at at 1000 and on out when the weather warms up a little. Times have changed since I posted this and I'm shooting a 30" barrel. The .34 BC that some people are getting for the API bullet I believe is a G7 instead of G1. Don't ask me to explain the difference I just know there is. |
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Here is Barrett's data
http://www.barrett.net/ammunition/50bmg |
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Best online ballistics program that I know of: JBM Ballistics
You can pick the bullet from a database and that will put the correct ballistic co-efficient etc... enter your muzzle velocity and range you zero'd the rifle at and, it will give you come ups and wind drifts etc. You can copy and past the info directly into an excel spreadsheet and make yourself range cards. |
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Originally Posted By JohnC76:
Any of you know the best Ballistics Calculator for an iPhone? I use shooter for android. Pretty sure you can get it on iphone. It's pretty good but, you have to enter a lot of data but, the good news is that it can account for just about anything... including if your scope doesn't track exactly correctly. |
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Originally Posted By jwoolf:
Originally Posted By JohnC76:
Any of you know the best Ballistics Calculator for an iPhone? I use shooter for android. Pretty sure you can get it on iphone. It's pretty good but, you have to enter a lot of data but, the good news is that it can account for just about anything... including if your scope doesn't track exactly correctly. I use Shooter for iPhone, and love it. Does everything I need it to, and more. Worth the $9.99 cost. |
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Originally Posted By 1st-Armored-Division: I think you missed a digit as I beleve a loaded mag from my M107 has around 130,000+or- energy blasting out of the full length barrell. Correct me if I'm wrong or misunderstanding something here. Oh and 38 ft does seem drastic, as I can see a RO freaking and yell to quit aiming for the jets. Thanks.Originally Posted By 1st-Armored-Division: Originally Posted By shadowskinner: Hi, I am getting a bullet drop of around 38 feet (465 inches) in the MBall and Sierra software using the following data: Magtech/CBC 656 gr, BC .364, Muzzle Velocity 2952. I got the numbers from Cabelas Magtech/CBC 50BMG and Magtech.com A 38 ft drop seems awful extreme at 1000 yards NO SHIT!. Does this mean this ammo is crap for long range? I have access to it at my local shop and at a very good price. It did shoot a sub 1 MOA group from 100 yds though? I havnt had a chance to get to a bigger range yet so I was messing around with the software trying to get an idea of what i would be dealing with. So does that calculation seem right? I think you missed a digit as I beleve a loaded mag from my M107 has around 130,000+or- energy blasting out of the full length barrell. Correct me if I'm wrong or misunderstanding something here. Oh and 38 ft does seem drastic, as I can see a RO freaking and yell to quit aiming for the jets. Thanks. |
smithc6: IM inbound
Merc1973: I did and the system says inbound does not exist and is not accepting IM's.
Merc1973: I did and the system says inbound does not exist and is not accepting IM's.
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Originally Posted By shadowskinner: Hi, I am getting a bullet drop of around 38 feet (465 inches) in the MBall and Sierra software using the following data: Magtech/CBC 656 gr, BC .364, Muzzle Velocity 2952. I got the numbers from Cabelas Magtech/CBC 50BMG and Magtech.com A 38 ft drop seems awful extreme at 1000 yards. Does this mean this ammo is crap for long range? I have access to it at my local shop and at a very good price. It did shoot a sub 1 MOA group from 100 yds though? I havnt had a chance to get to a bigger range yet so I was messing around with the software trying to get an idea of what i would be dealing with. So does that calculation seem right? I get 18.75' at 1000 with 750 AMax out of my 32" 99 using KAC Bulletflight. Depends on your conditions, though.
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smithc6: IM inbound
Merc1973: I did and the system says inbound does not exist and is not accepting IM's.
Merc1973: I did and the system says inbound does not exist and is not accepting IM's.
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Question for you guys with programs.
I shoot 808 grain brass bore-riders out of my AR-50 at 2860 fps (barrel is 34" long, bullets coated with Tungsten Disulfide). Compressed powder charge of V.V. 20N29 heated to 130 degrees F. Assuming a level barrel, what is total drop at 1000 yards? Assuming a 100 yard zero, how many MOA to get to 1000? My guess 24 to 26. Assuming a 200 meter zero, how many MOA to get to 1000? My guess 18 to 20. I normally leave my scope zeroed at 1000 yards with minimal changes for environment, altitude, and coriolis effect. Any other info you could provide would be greatly appreciated. THANK YOU in advance. |
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Oldman,
Just saw your post here. I have the shooter app on my phone. For $10 I thought it was a good tool. So far it seems reasonably accurate... at least with the .223 rounds I played with. For a 808gr at 2860fps, using the Lehigh ballistic data is as follows. 100yd zero shows a 212" drop, (20.3moa) & 2071fps velocity at 1000yds. 200meter zero shows a 204" drop, (19.5moa). Based on 3.375" sight height. Hope this helps. |
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JBM has just about everything you'd want for "factory" projectiles - multiple, free, online trajectory calculators, select at http://www.jbmballistics.com/ballistics/calculators/calculators.shtml
As far as calculators (free and for fee), see "Ranging and Target Solution Aids" at http://elr-resources.com/page6.html |
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Originally Posted By Radiant556: Originally Posted By nf9648: Id like to see a write up on the differences in velocity and energy between the standard M82A1 and the CQ version using military ball, AP, and API loads out to 1500m or more. Also like to see how far the CQ version will punch through steel plates at distance. I'll work on that, since I have a CQ and have access to a 107. Did this ever get produced? I'd love to have that info. I have a 82CQ. |
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