The words of XAUSA below: (Note the Enfield Action!)

The three cartridges are all wildcats I developed. The one on the left is simply a rimmed version of the .450 Watts, using .375 H&H Flanged Magnum cases.

The one on the right is a rimless .577, using .577 NE cases trimmed to 2.5" and the base turned down to form a rebated rim.

The one in the middle is my .505, with a 570 grain Kynoch solid displayed in front of it.

The other picture is of me with the first elephant I took with the rifle/cartridge combination.

I called the cartridge the .505 SRE (for Short Range Express). There was also a .375 LRE and a .416 MRE, which I abandoned as superfluous, and the .577 is the .577 VSRE (Very Short Range Express).

I used a Dayton Traister trigger and cock on opening conversion unit plus a Lyman 48 receiver sight and a Williams ramp and Redfield sourdough front sight to complete the project. The stock is by Fajan. Back in 1970 the choices of sights and accessories were quite limited.

As you can see, the stock has practically a negative drop. This proved it to be a good design feature, when firing off a magazine full of rounds in short order.

XAUSA and his 1971 Kenya Elephant taken with the 505 Short Range Express

Below we have more photos of the rifle and cartridges