I think the topic of Patterson’s battery has been discussed many times, over many forums. Very few photographs exist, and at that, none are very clear for the weapons in them. The best theories that I’ve come across were that the .303, his .450 double, and the 12 bore shotgun were all Army & Navy examples purchased before his posting to India. Some theories have him purchasing the .450 after his Indian service though. In reality I don’t think there is anything definitive as to what he used. If the Army & Navy theory is true, a BSA made Lee-Speed Sporting rifle wouldn’t be out of the question. It is possible however that he used a more basic model than the movie depicts. Something along the lines of what W.D.M. Bell described his own .303 as being.