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Theory says that the heavier weight BB should travel further than the lighter weight BB. Theory also says that the environment should effect the heavier BB less. But is the heavier BB more accurate and more precise than lighter BB's? We decided to find out using real practical tests; firing 0.2g BB's and 0.25g BB's from the same gun, at the same target, and with the same distance.
We downloaded the following free target from Evike's web site. This target has inches markings. But Evike provided a raster (JPG) image, not a vector file. Therefore, when we printed the image on our laser printer, the target wasn't to scale. However, the 7" mark was almost exactly 7 centimeters on our print out. Therefore, it provides a good relative measurement.
This target worked so well in our previous tests, we plan to keep using this target for our future tests as well.
For this test, we used the Shark Raptor. We built this gun in the "Build a Science Fiction Airsoft Gun" article. You can read all about the specs of this gun in that article.
The stock metal hop-up unit has been adjusted to be accurate and precise out to over 30 feet in an outdoor environment. It has a stock plastic H-hop spacer. The adjustment is accomplished with 0.2g BB's. We want to see if changing the BB weight changes the zeroing of the sight.
We used Angel Custom Professional Grade 6mm Airsoft BB (0.2g) and Matrix Professional Grade 6MM Airsoft BB (0.25 g) in this test. From our reviews, we know that Angel Custom, Evike, and Matrix BB's are manufactured by the same company. Therefore, there should be no inconsistencies between manufacturing processing in this test. Read our review articles:
The controlled environment is a dim garage to eliminate external atmosphere factors. The target trap is located 20 feet from the shooter. The shooter will hand-hold the shots to simulate real combat situation versus using a gun vise. 10-rounds will be fired into the target trap in semi-automatic mode. The shooter is free to take as much time as possible (within reason) to make accurate shots. Aim is performed with a single eye open (in order to reduce error) with the red dot directly on the center of the target (no manual adjustment of the shot is allowed). The red dot brightness is set to 1 in order to keep the MOA as small as possible, but highly visible this dim environment.
In the first test, we used the Shark Raptor airsoft pistol to fire ten rounds of the 0.2g BB into the target. The result (see result below) showed a fairly tight 3cm x 4cm grouping. This result is consistent with the final test fire result in our Angel Custom G1 Stainless Steel 6.01mm AEG Inner Barrel (110mm) Review. Therefore, we believe our test set-up is correct.
In the second test, we used the Shark Raptor airsoft pistol to fire ten rounds of the 0.25g BB into the target. The result (see result below) is quite surprising. The grouping has enlarged to 4cm x 5cm, far less consistent than the 0.2g BB's.
Looking at the two test fire result side-by-side, we can see the BB weight difference doesn't effect the accuracy in the horizontal direction too much; it moved the grouping to the left by 0.5cm. However, in the heavier BB does increase the grouping upward by 2cm. This significant increase in the upward direction may demonstrate the theory that 0.25g BB's will travel further than 0.2g BB's.