Well gents, mainly because I had some loaded rounds, but partially because you all got me fired up...I took the K-gun out today. Had crappy weather at 71* and sunny, but I made do. Same 410 Woodie softs and solids and same 108gr soft and 106.5gr solids loading of H1000...with Fed 215's of course. I think I lied....my 450 3.25" Searcy kicks MORE than the 500/416. That being said, the 500/416 will wake you up from a nap. I had forgotten just how accurate that gun is.
I personally think that a 410gr, .416 diameter bullet is about perfect for most anything out there....if you do YOUR job. I have not shot an elephant yet...2010...but I have shot buff, with both a 470 double and a 404 bolt gun. Both dead. This all being said, if I was strictly hunting elephants, I would choose the gun I did choose...a 500 Jeff bolt. However, if both buff and elephant were on the hit list and I had to take only one rifle, I would take a 416 in a minute....actually my 500/416. Taylor even states that for all around use aganist dangerous game in heavy cover, the 416 Rigby is about ideal....and a 500/416 loaded as I have it...is a 416 Rigby. In addition, my 500/416 velocities are REAL VELOCITIES taken 10' from the muzzles with an Oehler chrono. Robertson in his book states that some of the old velocities were a mite overstated. Regardless, a 500/416 double is one heck of an effective weapon if you hit him/her correctly. As big of an impact as my 500 Jeff....nope...but still a BIG wallop.
Plus, I'd make sure my PH wasn't carrying any "baby" rifle such as a 416 to back me up.

There's my $.05 worth.

Ripp....go get a 500/416 and I'll share some other load data with you....but I haven't been able to improve upon Krieghoff's H1000 data.

Merry Christmas to all.

Gary