Gentlemen and ADMINS here. This thread is even more dangerous than talking about realoading data and should be treated equally (at least).
We are speaking here about the assumed correct use of all sort of cartridges, with all sort of rifle grenades and weapons.
This is highly dangerous and should not be done in general nor I personally think should be discussed here on the forum!
Never use just anything that looks like a blank and combine with a rifle grenade that is on hand and use both in just any weapon which just happens to be in the correct caliber!!!
Propelling cartridges are very fine tuned to the grenades they are supposed to be used with and all this in relation to the weapon.
The fact that the grenade is launched and is flying far (and is kicking hard) is just an indication of a high gas pressure and a resulting fast recoiling breech which may damage the backside of the breech or the receiver (or both) and/or the shooter.
I serisously urge everybody to never fire anything that did not come in the same box (grenade and propelling cartridge) and that was not meant for the particular gun you are going to use!
I know there will be a doozen people saying they did such in the past and all was OK but anybody doing this is taking chances. If one likes that fine but never state on such things in the public or even recommend it to somebody else (as done above)!
By the way, Romania has no rifle grenades in the inventory so they also have no grenade propelling cartridges. And if not worse enough there is one recent lot of 7.62x54R blanks which can not even be fired from the PKM machine gun since they develop too much pressure and need modified BFAs (drilled to larger vent diameter). Draw your own conclusions!