User Panel
User Panel
User Panel
|
Posted: 11/20/2003 1:35:18 PM EDT
[#1]
Was the paper written by KevinB?
|
|
|
|
Posted: 11/20/2003 7:40:54 PM EDT
[#2]
I don't know maybe he can answer for us, It is one hell of a study if that is the case.
And if so, way to go KevinB- it looks like that illusive camo job finally worked out for you. That midlength FF RAS/M4 looks great. |
|
|
|
Posted: 11/21/2003 4:29:36 AM EDT
[#3]
Sounds like the rifle I'm currently building, except I'm using the DD rail instead of the SIR
|
|
|
|
Posted: 11/21/2003 4:31:43 AM EDT
[#4]
yes it was written by him. has caused a stir up here too at www.canadiangunnutz.com - check out the black rifles section.
Ruff |
|
|
|
Posted: 11/21/2003 10:38:36 PM EDT
[#5]
Quoted: Was the paper written by KevinB? Yup, and proof-read/edited by yours truly. I think Kevin did a damn good job, too. -Troy |
|
|
|
Posted: 11/22/2003 1:11:24 AM EDT
[#6]
Hmmm... it says Black Hills MK262 ammo chronos at UNDER 2600 fps and my 14.5" rifle shoots it at an AVERAGE of 2660. My rifle also shoots MOA so I believe the benefits of the midlength 16" are a bit misleading there. The rest of the article is great.
Page 8 has a space in the word "la rge" lol |
|
|
|
Posted: 11/22/2003 2:29:14 PM EDT
[#7]
It was originally in HTML; the conversion to PDF sometimes does screwy things.
Also, remember that Kevin is up in Canada where it gets pretty darn cold. That lowers velocities... -Troy |
|
|
|
Posted: 11/22/2003 2:54:45 PM EDT
[#8]
Guys yes indeed - and a hearty thanks to Troy.
I am waiting to get some more Mk262 as some of the numbers generated were way off what others got, - the only strange results were from it, not other ammo. We have a rifle/carbine midlife project going, and I an none to thrilled with it - this was my second shot across its bow. Interesting reads... [url]http://www.canadiangunnutz.com/viewtopic.php?t=12813[/url] [url]http://www.canadiangunnutz.com/viewtopic.php?t=22451[/url] [url]http://armyapp.forces.gc.ca/army/Snitz/English/topic.asp?TOPIC_ID=9[/url] There some even better arguments on our DIN but its a closed server and you need a CF loggin to access at work... |
|
|
|
Posted: 11/23/2003 4:54:36 AM EDT
[#9]
KevinB, good read!
|
|
|
|
Posted: 11/23/2003 8:05:41 PM EDT
[#10]
Troy, I know lower temps increase air density and casue more drag over time. I was not aware that cold temps also would result in lower velocity at the muzzle. How much velocity is lost at the muzzle at various temps?
|
|
|
|
Posted: 11/23/2003 8:34:47 PM EDT
[#11]
DevL
I had trouble with one box of Mk262, unfortunately I had no other number to insert and those stood. After Christmas I should be able to generate some more data with the SPR barrel length and re-shoot the Mk262. -Kevin |
|
|
|
Posted: 11/23/2003 11:34:45 PM EDT
[#12]
Quoted: Troy, I know lower temps increase air density and casue more drag over time. I was not aware that cold temps also would result in lower velocity at the muzzle. How much velocity is lost at the muzzle at various temps? Like everything ballistic, it depends on a lot of things, like powder type, barrel length, and so forth. But, assuming 70F is your baseline, it would not be unusual to lose 50-60 fps at 32F. Again, it could be 40, and it could be 80, depending on a number of factors. Ball powders (which most standard, as opposed to match, military loads are loaded with) are typically much more sensitive to temperature than cylindrical ("stick") power like Varget, IMR, Reloader, & VV. That's why I ask folks to report temp, humidity, and elevation when giving chronograph stats, so that folks can adjust or just get an idea of how different conditions affect ballistics. That's also why these and other factors are included in the ballistic computers in, say, M1 Abrams tanks. -Troy |
|
|
|
Posted: 11/24/2003 10:29:30 AM EDT
[#13]
Troy,
I did have the temp, humidity, Alt and Barrometric Pressure recoded for that day - but It was on the a different page than most of the recording and F knows where it went. Anyway I am stockpilling some ammo for a test Feb/March - I love to be able to head down to Tex and link up with Brou and some others, but my travel plans don't look like it will happen. Plus I am waiting on two new rifles (and 1 I have not ordered yet before I do more testing) -Kevin |
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
