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US Army Paintball

DraXxus

Product Testing performed with DraXxus Paintballs

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Stryker STR-1
by Bill Mills - Photos by Dawn Mills - May 2008

Features HowItWorks Disassembly Adjustment Testing Data

RAW DATA

WARPIG Ballistic Labs Test Results
Test Subject: Stryker STR-1 Gas performance comparison
Paintgun and Air System: Stryker STR-1, stock barrel - Crossfire high output HPA system.
Variable: Power Source - CO2 vs HPA
Chronograph strings: Each string represents a string of 30 shots fired at approximately 1 second intervals.
Paint: DraXxus Hellfire

Shot Number
CO2
HPA
1)
110.4
263.0
2)
199.4
256.2
3)
267.2
264.4
4)
280.6
258.8
5)
283.0
257.6
6)
283.4
253.2
7)
275.4
268.4
8)
283.0
267.0
9)
241.0
261.2
10)
287.2
264.6
11)
285.6
254.2
12)
283.2
258.0
13)
283.2
253.8
14)
281.4
252.0
15)
271.0
260.0
16)
286.6
261.0
17)
279.2
262.8
18)
272.2
266.0
19)
278.4
258.4
20)
278.6
264.8
21)
277.2
263.6
22)
271.0
258.8
23)
280.4
266.0
24)
274.2
253.8
25)
266.2
263.4
26)
275.8
267.0
27)
270.0
258.4
28)
269.8
274.2
29)
275.8
266.2
30)
273.4
267.0
High:
287.2
274.2
Low:
110.4
252.0
E.S.:
176.8
22.2
Ave.:
268.0
261.4
S.D.:
34.0
5.2
95%:
±14.0
±2.0

Understanding the Summary Data

High: This represents the highest velocity in the recorded string of shots.

Low: This represents the lowest velocity in the recorded string of shots.

Extreme Spread: E.S. is the difference in velocity between the highest velocity shot and the lowest velocity shot.

Average: This is the average velocity of the string of shots. This is the number to look at to compare whether velocity is increased overall, or decreased overall by a change in a variable.

Standard Deviation: S.D. Is a mathematicall way of expressing how close most of the shots are to the average. The lower the Standard Deviation is, the more consistent the velocity is.

95%: This is an easier to understand way of expressing consistency. Statistically, there is a 95% chance than a given shot will vary this amount or less from the average.

Target Groupings

Target groupings were fired with the same setup, the test marker stand mounted, fired at a rate of approximately 1 ball per second under manual control, in two groups of 20 shots. Distance to the paper target was 75 feet, and the variable between the two groupings was the barrel - the marker's stock barrel compared to a Freak barrel with paint matched insert and All-American front. Photographs of the targets were then digitally adjusted to compensate for distortion produced by camera angle, so that they could be directly compared. The target comparison image on the testing page of this article is a composite of the two photographs, with colored highlights of the impact points to provide a direct visual comparison.

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Thanks to Andrew Cannon and family for assistance in chrono and target testing.

 


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