Raimey,

any such comparison of those 2 calibers will depend on the bullet weights and other factors, I will not hazard any guess here.

RWS Wiederladen (the "Blue Book") has data for the 5,6x61R, but only for the 4,6 g (app. 70 grain) bullets intended for the .22 Savage HP (5,6x52R), noting that these bullets are on the soft side.
Min and max loads with R 907 and R 904 are given.
Then there is this note: for internal ballictic reasons (whatever these may be?) R 905 is not suitable and shall under no circumstances ("keinesfalls") be used.

In my QuickLoad powder chart H4381 is listed on almost the same level as R 905.

fuhrmann

Last edited by fuhrmann; 08/31/25 06:52 AM. Reason: addition