Well, there are at least five options:
1) I'm lying
2) I was unable to measure ranges accurately for those particular blasters, but ok for the other ones tested (I also tested the piston-based Nerf Super Soaker Splatterblast)
3) I made all the statistics up (similar to one, but with more creativity)
4) I got significantly stonger
5) there is some actual difference in these water blasters models to explain their increased range performance
Unfortunately, I haven't done full stats for many piston-based blasters before.
For an older model, the Nerf Super Soaker Shotwave
, it's functional range was measured at 10.5m for angled shots. Its output was measured at ~20mL/s (~0.6oz/s).
For the Water Warriors Drench Master
, it's functional range was measured at ~12m for an angles shot (1.5m farther). Its output was measured at nearly 40mL/s (~1.3oz/s).
As seen on pressurized water blasters, those with stream settings that have larger available output tend to get better range. Whether output explains the difference in this case remains to be seen, but I can say multiple shots were done so these are not just from some fluke shot.
Of course, it just cannot be output since the Water Warriors Steady Blast
has a measured output for only ~17mL/sec (0.56oz/s), but also was able to hit the 12m mark. However, the Steady Blast, though piston-driven, behaves like a pressurized blaster when pumped rapidly. My recollection was the initial stream only reached around the 10m mark, but as the strream continued through continued rapid pumping, range reached by the stream increased.
In the end, *ALL* statistics on iSoaker.com should be taken with a grain of salt. I am usually only able to test one or two samples at best and variation between how well these blasters are manufactured could easily account for variation in their performance. I wouldn't be surprised if many blasters of the same model shows a 1m-2m difference in range due to consistency of nozzle size, nozzle smoothness, stream lamination, tubing smoothness, pump-consistency, etc.