79 and going strong...... I wanna be like you! Thank you for the kind advice.I will be 79 next month and still enjoy the big bores. I was also extremely myopic until I had Excimer surgery years ago. Since then I have experienced tears in both retinas. The left eye when hit by a softball and the right eye after getting too close to the scope on a 300 Win Mag. Since the tears I still shoot my 416 Rigby, 450 NE, and 470 NE with no issues other than at my age I do not agree with open sights. I have RMRs on my double rifles.
With respect to calibers, with the modern bullets (Woodleigh Hydros) I would believe the 450/400 to adequate for Elephant and as the client you have the PH for backup. I also second the choice of a Heym 89B. I love mine in 450NE and I have been able to handload reduced loads that regulate.
Hope you can get to Dallas to shoot the Heyms and I am sure you will enjoy your time with Chris.
VC offers it as wellOf the ones you listed the 450/400NE 3" would be my first choice with the 470NE a close second for the same reasons so many others have stated.
However I would like to offer up one that isn't listed...the 416/500NE. This cartridge is of much more recent design, I believe 1996. It was made to handle modern powders and bullets. There are several bullet offerings when it comes to the .416 caliber for reloading. It has a tapered design to feed easily in a double rifle.
Lastly are the ballistics. Compared to the 450/400NE, it's not even close. The 416/500 produces 5000 lb-ft of energy at 2400 fps making it perfect for elephant or buffalo. Heym and Krieghoff both offer this cartridge in their doubles.
Thanks for the encouragement! By the way, love the hat, love the double rifle, and what a great trophy.I would go with the .500 NE, don't be afraid of the recoil as it is negligible with the right technique and training. Most of the people that are afraid of the recoil are those who have not fired a big bore rifle more than a very few times, if at all.
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Having been charged by an elephant and been the one that brought it down, I was glad I had a .500 caliber rifle with me at the time.
I had a beautiful one in 450-400. Runs $13-$14k new. Best place to buy new with them in stock is Champlains in Enid OK. They will fit to your LOP if desired450/400 3”. I’d take a pretty hard look at chapuis.