mcarterbrown.com  

First Strike Everything first strike related

Reply
 
Thread Tools Search this Thread
Old 03-13-2014, 12:35 PM   #1 (permalink)
Shaped Ammo Advocate
 
Whiskey Hammer's Avatar
 
Join Date: Nov 2013
Location: Jacksonville, FL (and a lot of the time, Tampa)

First Strike Test Series, Part 1: Intro and Manufacturing Consistency

A semi-formal data driven analysis of paintball's leading shaped projectile. Now with 121s!!! Courtesy of scotallen1986.

Contents
  1. Intro and Manufacturing Consistency
  2. Dual Chrono and Drag Curve Bracketing
  3. Accuracy
  4. Redacted
  5. Redacted
  6. Redacted
Intro
Shaped ammo represents the next step in paintball evolution. Will it supplant classical spherical ammunition? Certainly not in the near future. But it is the only advancement to inarguably break the ballistic performance plateau that paintball has experienced in the past decade plus. Iím passionate about paintball, and Iím especially passionate about the possibilities of shaped ammunition. To that end, these tests and arguments are largely to answer my own technical questions about First Strike rounds fired from rifled barrels, and if that kind of thing interests you (you nerd), to put good data out into the community.

Obviously a lot of those questions and data will center around how to improve the performance and understanding of the system. This has twofold benefits. Firstly it improves the existing community. Players will be better equipped to employ the system effectively and to achieve greater success with it. And secondly, the raw performance of the system will inevitably attract more players; the more we can improve the system, the more appealing it will be to the broader paintball community.

And maybe in all that performance pushing Iíll stumble on something I can make a buck off of to help offset these costs. But if not, then itíll still make a cool resume padder for when Iím out of school and looking for a job in the industry.

TL;DR The mag-fed long ball game is the most exciting thing in paintball. Come to the long side. There are no cookies.

The Why and the Before
Why bother with manufacturing consistency? Because it influences a lot of ballistic processes like accuracy, efficiency, and chrono variations. Additionally, itís generally useful data for other non-ballistic analyses like equipment or technique choices. In this series weíll be incorporating the data directly into our accuracy and drag tests. But you might use it to better select bore sizes or to decide if itís worthwhile to sort your ammo.

Other people have evaluated the FS rounds before - uv_halo, janclage, jjron99, etc. - but this test offers improved currency and sample size even if it's more limited in depth (especially when compared to uv_halo's work). For our purposes we'll focus on size, weight, and any noticeable defects.

The Numbers
Here on Google Docs. The highlighted cells contain noteworthy data.

Methodology and Interpretation
Due to the size of the sample and the ease of the method, I ended up using a hammerhead paintball sizer. It has six size groupings, which were all verified against a digital caliper. All of the sizes were found to be accurate, except for the .693 hole - which consistently read .694 or larger. Therefore, our final size groupings will end up being:
  • less than or equal to 0.679
  • 0.680-0.683
  • 0.684-0.686
  • 0.687-0.688
  • 0.689-0.690
  • 0.691-0.694
We can roughly narrow the range of possibilities for a given round by observing how easily it passes through itís grouping sizer. If the round falls through the sizer only when itís perfectly aligned we can safely assume that it leans towards the larger end of itís range. Likewise, if the round passes through the hole easily, then we can safely assume that it leans towards the smaller end of itís range. Basically the larger the round relative to itís sizer the less room for error. But due to the informal nature of this method, these observations will be included (where appropriate) in the conclusions rather than the hard data.

Weights were measured via a digital powder reloading scale with an advertised accuracy of 0.001g. The scale was tared in a room with no ac or fans to minimize influences on the read. The rounds were allowed to sit on the scale until the display settled and held on a number for a reasonable amount of time. A random sampling of 20 rounds was used for each major size grouping.

Each round was visually inspected for manufacturing defects.

Thoughts on the Data
We got a total of 518 rounds from 5 bulk boxes. Thats 3-4 extra rounds per box with less than one dud each. Iím digging that quality. And when I say dud, I mean a round with a slight but easily removed lump where the skirt joins the cap. So, not even a catastrophic defect.

The rounds exclusively divided into two groups. The 0.687-0.688 group and the 0.689-0.690 group. This was at about a 2:1 ratio for a rough split of 13 ďsmallĒ rounds and 7 ďlargeĒ rounds in the average random 20 shot group. This is important in the event that size consistency affects accuracy. The average player doesn't sort his/her rounds so this ratio will be used to reflect the average unsorted shot group makeup in future tests.

Informally though, the rounds in the 0.687-0.688 group were near uniformly difficult to pass through. The 0.689-0.690 group however, were near uniformly easy to pass through. This suggests that the rounds tend to either be .688 or .689 with more of an emphasis on the former.

The weights fall across a very narrow range and don't seem to differ significantly between the ďsmallĒ and ďlargeĒ groups.

The small size and weight variance don't add much evidence to the idea that sorted rounds are more accurate than unsorted.

Finally this data is mostly consistent with the previous work on the subject, while the caliber range is noticeably more concentrated. This suggests that the Tiberius and Perfect Circle have been improving their manufacturing process over time, which is not entirely unexpected but still nice to see.

Thoughts on 121 Data
The 121 exist over a wide range of sizes. But itís a little more complicated than that since nearly every round had some degree of confounding burr on it. The rounds are so spread out over the range of sizes that I didn't bother calculating the proportions or setting up proportional groups for the test. But at least the weights are more or less consistent.

The defects though... four rounds were punctured on arrival but thankfully, didn't contaminate the rest of the rounds. These four rounds were likely punctured in transit by the spikes present on over 60% of the 121 rounds. Some rounds had this spike clipped with varying degrees of success. Most didn't.

Nearly all of the skirts had some degree of pocking where the sprue connected to the skirt. At least eight rounds had some portion of sprue left over. Enough to make them unable to pass through a sizer, let alone be in loaded or fired. This is reflected in the ď95+5Ē total column. 100 rounds total, but 5 that were unsortable out of the box.

Finally two rounds arrived dimpled but were easily rolled around to a clean face.

Also note how lightweight the 121s are when compared to the FS rounds. The FS rounds are nearly twice as heavy. In what little testing weíve had time for with the 121s, they routinely clocked at 100 fps faster than FS rounds when used at the same regulator settings. We don't have a full understanding of why yet, but the weight certainly contributes.

All in all, comparatively poor quality. With at least one common defect severe enough to potentially ruin an entire bag. Having said that, Iím withholding any long term condemnation of the round. I recall Tiberius/Perfect Circle had some quality control issues in the early days (though admittedly not this severe) so Iím willing to extend a stay of judgement until a little further into their manufacturing timeline. Lets see how they develop.

Closing Notes
Be sure to take a look at my about page for the thankyou's and acknowledgements, it's worth the jump.

Finally, two things in closing. If you're technically minded and you see some aspect of the data or argument that can be improved, feel free to drop me a PM or post. Self-initiated and community driven edits are expected to be ongoing. And if you haven't seen it yet, and you have a real interest in FS rounds, check out my FS Demographics poll.

Thank you for reading, and we'll drop the accuracy and dual chrono data in a week or two.

Last edited by Whiskey Hammer; 03-30-2014 at 04:13 PM.
Whiskey Hammer is offline   Reply With Quote
Old 03-13-2014, 03:14 PM   #2 (permalink)
Active Member
 
Join Date: Aug 2011
Location: Vancouver, WA

Great work! Can't wait to see the data you collected.
shibyman is offline   Reply With Quote
Old 03-13-2014, 05:40 PM   #3 (permalink)
Rec Poster
 
Join Date: Jul 2009

Neato! Looking forward to seeing what you've come up with!
scottallen1986 is offline   Reply With Quote
Old 03-13-2014, 05:57 PM   #4 (permalink)
BOOM headshot!
 
freedummy's Avatar
 
Join Date: Aug 2012
Location: Calgary, Alberta

You're my hero for doing all this!
__________________
Quote:
Originally Posted by The Flounder View Post
We don't do easy here! Here we do different and not done before!
My feedback: MCB / a5og / eBay
freedummy is offline   Reply With Quote
Reply

  mcarterbrown.com » Paintball » The Armory » First Strike

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -4. The time now is 08:17 AM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Optimization by vBSEO
© MCB Network LLC