Austrian / Hungarian  Army rifles.
Steyr 8x56R rifles can use one of several different blanks for differing uses.

The best all around blank is a full length 7.62x54R blank giving both smooth feeding and clean ejection.

A cheaper option is short crimp 7.62x54R surplus blanks.  While feeding is a bit slower it is an inexpensive option that provides good sound / flash.

If the round is being used in a machinegun a special round can be made for film use to provide the proper bullet profile.
Steyr M-95 rifles.


 
7.62x54R Full length

$46/90
_____________________


Surplus 7.62x54R
Short crimped blanks
(corrosive)

$18/100
Slow feeding, safe, inexpensive option
===================

Machinegun

$5 / round