a possible goof

Rating: 8/10 (31 October 2006)

maybe a SPOILER
I am not sure how it works in America, but usually they will have to shoot blanks at a funeral. I just do not see the guard of honor using live ammunition. At least that's what other countries practice.
At the funeral in the movie, we see two consequent shots without reloading - which is hard to achieve with blanks, due to the lack of retraction of the loading mechanism. The gases fired are not enough to reload the weapon without a bullet of some sort.
Correct me if I'm wrong.
What is the usual practice in US in this case?