The test was completed in Knoxville, Tennessee on April 6(5am-12am), 7(12am-1am & 8am-11pm), 8(6am-4pm), 13(6pm-8pm), 14(8am-12am), 15(12am-3am & 10am-8pm), 20(5pm-11pm), 21(8am-12am), 22(12am-4am) 2007.
All the testing was preformed inside a building to insure that there were no external forces on the balls. The building was temperature controlled, and stayed between 68-74 degrees F. The humidity for each day stayed between 27-35%. The elevation for Knoxville, Tennessee is 1200 feet.
The marker used was an AGD Xmag. The marker was secured to a drop forward, and the fore grip (battery pack) was placed in a vice to insure that the marker was unable to move. Both the drop forward and vice were screwed to the table. We also secured 3 scuba tanks to the table to insure that the table should not move.
(please note that the detent on the marker shown was not what was used. That was a side project that we were playing around with. It is a 8/32 barb fitting threaded into a detent to measure the pressure that is placed on the paintball while firing the marker)
(setup in my basement)
(the actual setup while we were using it)
(A view from where I was working)
A Paintball Radar chronograph (the red one shown above) was placed in front of the marker so that it would allow all balls to clear the top of the chronograph by about one inch. A second chronograph made by RADARchron (the yellow handheld version) was used to insure the accuracy of the other unit. The marker was chronoed before recording any data upon every barrel change. Our desired velocity was 280 FPS.
The target plane was placed seventy feet from the breech of the marker. The outer parameter of the target was roughly 36” X 30”. Paper targets were placed on the target to allow the recording of location of each shot.
A Tenma decibel meter was placed thirteen feet in front of the marker and off 22.6 degrees to the left for half the shots, and twelve feet perpendicular to the marker for the second half of the shots. The decibel meter has a built in calibration adjustment function, and was calibrated before testing each barrel.
(Decibel meter location)
All barrels were washed with warm water and soap, rubbing alcohol, swabbed with a cotton swab ,and squeeged with a silicon squeegee before using them.
("The cleaning table")
A 10% sample of each type of paintballs was taken upon opening each bag of paintballs. Those balls were measured for their diameter and weight. All scales are up to date on calibrations, and are NIST traceable.
A xxxxxx bore sight was used before taking any shots with the paintball marker to insure that we knew exactly where the barrel was pointing. After the laser dot was projected on the paper/target a sharpie was used to make a dot. This reference point is how we measure the location of all shots.
(a target getting setup)
For every barrel kit we shot 25 balls from four different brands of paint through each bore. The target was changed when switching between the brands of paint.
All the barrel bores and fronts were measured to compare the actual diameter and stated diameter. This was preformed using a telescoping gague along side with a micrometer. The measurements were taken from roughly 2” inside of the barrel. Each bore was measured ~5 times, and an average was determined. All measurement equipment is up to date on calibrations, and is NIST traceable.