Change spring to use different ammo?

[DonVoigt]

Originally Posted by k38

My 1920 alphabet likes Fiocchi . . .

There are at least three or 4 versions of 7,65mm ammo by Fiocchi;
starts out with FMJ vs PSP; then grey, purple , and black boxes- all different vintages and performance, as they are loaded to various velocities and different OAL lengths.

There are several good and long threads on 7,65mm ammo and function on the forum.