Airsoft Canada - BB Brand and weights

Had this in mind 2 years ago but I keep forgeting.

Analytic Balance Result for Excel 0.2g, MetalTech 0.2g and KSC 0.25g
Measurements are +-0.0001g

Randomly picked 5 bbs from each bag and brought it to my chem lab.
Each BB is weighed twice, one is before I pick them up with my fingers and one is after. Both measurements are the same. The oil from my skin did not have a noticable affect on their weight. However it may affect the friction on the hopup (still need to devise a test for that). I had a long list of diameters somewhere. I'll post those up when I find them, but they may be out of date by now since BB molds will wear and everything depend on QC at the time.

Sept2006
Raw data only

Excel 0.2g (new mold versions)
0.1906g
0.1940g
0.1935g
0.1941g
0.1943g
Mean of 0.1933g
Below the stated weight, Max Range difference of 0.0037g

MetalTech 0.2g (white)
0.2068g
0.2079g
0.2089g
0.2033g
The fifth was contaminated when it rolled into some NaCO3 powder
Mean of 0.2067g
Above stated weight, Max Range difference of 0.0056g

KSC 0.25g
0.2418g
0.2454g
0.2486g
0.2459g
0.2442g
Mean of 0.24518
below stated weight, Max Range difference of 0.0068g

Later addons are
Straight/Digicon 0.36g non graphite, 0.42g Graphite
Guarder 0.28g
Systema 0.20g
Maruzen 0.30g
... anything else I can get my hands on.

Systema 0.2g
max reading 5.91 +- 0.01mm
min reading 5.86 +- 0.01mm
Average diameter 5.88mm +- 0.01mm