thanks for that link, its a peach.
shedhead
no it wouldnt as your rim fire round would be weighing at 40grns as that is the average weight for sub sonic. therefore your rimfire running at 980 is knocking out about 85ftlb which is correct. hence if you were using high velocity rounds they weigh a lot less usually around the 32 grn weight the velocity comparable will be a lot higher.
980x980x40 divided by 450240 =85.32ftlb.