That information about the FA 1907 trial .45 revolver cartridge is essentially what I and others have pieced together. I've seen, as previously stated, that some of these rounds have the bullet staked or punched in place as there were problems encountered with the bullets backing out under recoil. But the real question is, is this cartridge the same as the mysterious so-called .45 (S&W) Special or .45 Frankford? And what were the S&W TLs used in the trial chambered for - .45 Colt or something else?

There was also considerable trouble with the FA ammunition quality, and some handgun submitters requested, and were granted, the latitude to use commercial ammunition made to the same Army specifications. I don't know what the headstamps of the substitute UMC commercial .45 Revolver ammunition were - maybe .45 Special?