The steel and design of the Model 1889/96 rifle is the same as was used for the M1911 series. The big change from the 1889 to the 89/96 was the placement and size of the locking lugs. Locking lugs on the back of the M1889 locking sleeve made the bolt susceptable to failure by instability buckling; thus the 1889 could not be "upgraded" to fire the GP11 cartridge. The 89/96 didn't have this problem ... locking lugs are further forward and a little bigger, thus the change to the revised chamber to fire the GP11 cartridge was feasible. AKAIK, the Swiss treated the 96/11 and 1911 series as a single category with regard to ammunition, maintenance and overhaul. The M1889 was recognized as weaker and was not to be fired with GP11 until the WW II mobilization, when the use of GP11 in the M1889's still in the hands of the Landsturm was authorized for "war emergency use only".
Resp'y,
Bob S.