Ken Waters wrote that he had a Ruger factory chambered Ruger M77 in .416 Taylor in his possession - the gun he used for the artical and load developement, of course. Ruger failed to go ahead with those plans on the .416 Taylor - obviously.

Waters was also able to achieve 2,400fps with 400gr. bullets. This is quite remarkable, as Ken has always been quite conservative in his loads. He did note he had to use the slower burning IMR4320, compared to "Charlie's"( think it was C. Askin's) IMR3031.

John Whooters is one more hunter who used a .416 Taylor for Cape Buffalo. His loads were 2,400fps using IMR420 with the Colorado Custom(early Barnes, were't they?) pure lead cored, copper tubing jacketed 400's - spun closed for solids and rounded lead tipped for softs - all in .049" jacketes. At that time, you could get either .032" or .049" jackets for every bullet diameter made. Today, all the 'original' Barnes have only .032" jackets.

This is all IIRC. Sometimes the memory works well, sometimes it doesn't.