Article Index
FPS and BB weight, the science behind it.
.20g Performance Data
.25g Performance Data
.20g vs. .25g Charts
Wrap Up
All Pages

Again, we are interested in the last thee columns of data. Since all of this data is hard to understand, this data is formed into three separate charts that relate these three variables to each other graphically.

As you can see in the first graph we have constructed, lines for the .20 and .25 gram bbs are visible. This graph shows the relation of the data calculated in the two previous spreadsheets. Specifically, it shows the relation of velocity versus distance. The conclusion drawn from this graph shows that .20 gram bbs have a much higher initial velocity and they retain that velocity until they reach around 50 feet. This is the point at which the .25 gram bbs retain their energy longer and better, which results in a lengthier sustainable fps. Since the .20 gram bbs have a higher initial velocity, the drag force applied to the bb is much higher. Since they are lighter than the .25 gram bbs, they cannot retain their momentum as long; therefore, they lose velocity at a more rapid pace than their heavier counterparts. Also, the loss of momentum relates to the stability of the bb during flight through the air, which in result is the reason why .25 gram bbs are more accurate at longer distances.

The next graph shows the relation of velocity versus time applied to the .20 and .25 gram bbs:

This graph is illustrates the velocity of each bb over specific time intervals. Here, it is again obvious that the .20 gram bbs, since they are lighter, have a higher initial velocity. Again, due to the drag forces involved with higher velocities and the lower weight of the .20 versus .25 gram bbs, they will lose their velocity and drop below that of the .25 gram bbs after only 0.25 of a second. This is very important to us in the area of specific shooting conditions. If you are playing close quarter battles or assaulting, it might seem more feasible to use .20 gram bbs rather than .25 gram. This is because they travel faster to your target as long as the flight path from muzzle to target will take less than 0.25 of a second. If you are support or sniper based, this would recommend using .25 gram bbs because they retain their velocity longer at lengthier flight time intervals over 0.25 of a second.

The final graph shows the relation of distance versus time:

This graph is important to us because it shows the distances attainable with .20 gram versus .25 gram bbs based on a time-oriented scale. It is somewhat hard to see but for the first 0.5 of a second, the .20 gram bbs will reach their target quicker. This will be the case from 0-90 feet as shown on the graph as an intersection of the two lines. At this point, the two bbs will both reach their target at the same time. After this time, the .25 gram bbs will travel further quicker because they do not lose their momentum as well as velocity as quick as the .20 gram bbs. This shows that for shots less than 90 feet use .20 gram bbs, for anything over, this study would recommend .25 gram bbs.

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