I understand this is not a reloading forum but years ago a shooter, collector, reloader was trying to locate 7.7 cases, he was a serious shooter. I formed 80 +/- a few cases and shipped them to him. When I formed the cases I formed 20 cases that were minimum length, I formed 20 cases that were go-gage length, I formed 20 cases that were no go-gage length and the rest were field gage length.

The logic; he did not know the length of the chamber from the shoulder to the bolt face. The minimum length sized cases allowed the bolt to close, go-gage length sized cases allowed the bolt to close with slight resistance; the no go-gage length cases would not allow the bolt to close nor would the field gage length sized cases.

To use the no go-gage length cases and the field gage length cases he had to size and trim the cases.

F. Guffey