I own and shoot the 500/416 in a Krieghoff double.

I have a copy of data published by Krieghoff for reloads using the 410 gr, Woodleigh bullets and H1000 powder that shoots VERY well in my rifle at 100 & 150 yards.

I just got it back from having a pivot mount installed for a S&B 1.1-4 scope on it. I took it to a friends range the other day and we easily blew up many 1/2 size concrete blocks at out to 150 yards. Works for me. We then moved to a 12" steel plate and used the iron sights at 100 yard. No problem ringing the plate until we blew it off the chains.

Good thing I reload for this rifle as the 2 of us went through 60 rounds. No ill effects from the recoil.

I like it!!! I also have a video of the rifles former owner using it on Cape Buff and Hippo on his hunt in Mozambique. Worked well for him and I'll be trying it out in September very near where he was hunting. Hope it works as well for me.

Good Luck.

Mike