The film you're thinking of may be 'White Hunter, Black Heart', but if so it was an M1903 Mannlicher Schoenauer.

It's a pretty cool flick, I have it on DVD. The movie is semi biographical in that it was written by Peter Viertel, who as a young writer was on location with the John Houston production of The African Queen. Eastwood's character in White Hunter is based on Houston.

I bought the DVD for the scenes with Mannlicher Schoenauer rifles. Eastwood's character is outfitting for safari at an expensive London salon when he says, "And throw in a couple of these little six point fives, the Mannlichers".

Several scenes show MS takedown rifles being carried and in use.

BR.