As I said before, these later cartridges (1950+) seem to have softer case heads, allowing possible primer drops. On the plus side, they employ the improved case head and a visible anneal on the neck & shoulder. Season cracking of case necks was a common problem after 1946 or so, especially in 1947 dated lots. The best year, generally speaking, has been 1949. Besides still having tough case heads, that year is the beginning of the visible neck/shoulder anneal and the switch (about mid year) to a non-magnetic GM projectile. The MG-34 will tolerate a wide variety of loading's with the standard 11mm blast cone. German service cartridges have several bullet weights/lengths, including a number of HV loading's. All can be used in German ground guns in good condition. The Turkish ball loading's are duplicates of WW1 & WW2 (1939 only) and employ similar powders (2.0x2.0x.045mm) and projectiles. QC can be an issue though, with considerable variations in pressures & MVs. I have stopped using Turkish "S" ball in most of my MG's except for Maxims & ZB's, and then only lots proven to be OK. Regards, JH