OMD I understand what you mean about empirical data and application of basic equations to reality, but if we are to compare bands and spears rather than shooting distance, then up to the point that the spear leaves the gun, perhaps the hydrodynamics could be neglected? also, as the question is to do with relative measures, or comparison, then if you apply the same case to both band/spear scenarios, do you think they wouod give a reasonable relative measure?
