I saw the movie and I think that the rifle was an early version of a sporterized Long Lee-Enfield, some of these had truncated military forarms and different buttstocks, the mags were cutdown to five rounds, so, they did not protrude. I once had a Geo. Gibbs & Son. custom rifle on this action, it had a horn forend tip, superb quarter-sawn wood and the original mag-cut-off plate. I let it go, long ago, as guns like that were a dime a dozen here in Canada until the Yanks went bonkers over old English guns, starting about 20 yrs. ago.
I just saw one of these listed at a "carriage-trade" gun dealers in Montana for $2400.00 USD, I could have bought this very same rifle in Victoria, B.C. for about $600.00 four years ago.....go figure....
I agree, it was a crappy movie, but, the Americans have absolutely NO understanding of how Victorian-Edwardian Englishmen behaved and the Yank "White Hunter" was a very poor take-off on "Bwana Cottar", IMO. I used to know a number of people of that type who were actually there in
that era, so, I have some knowledge of it. Ah, the "Glorious Days of the Raj", eh wot!