I don't think there is any disagreement between my statement and yours, Miller. Certainly there is back thrust when a shell fires. What I think I failed to state was the difference between thinking that the shell itself, and alone, moves rearward against the breech. It moves, but with the barrel.

Thanks, as always, for your clear and understandable way of explaining the principles at work.

SRH

May God bless America and those who defend her.