Hi guys,
Having followed lots of threads over the last few years, I suspect some of our American cousins will know the answer to my query:
Assuming a normal load of an ounce of bird shot propelled at about the speed of sound (1150 fps here at sea level) then is there any pressure difference between such loads fired in a 12 bore/gauge compared with a 20 bore/gauge?
My unscientific hunch is that the required pressure level may need to be higher in a 20 bore, but perhaps there is less friction in the smaller bore??
Here in Britain no-one seems to test or quote pressure levels. I have noticed that 20 bores SOUND quite different to 12 bores, but that could be different loads of course.
HB
