Another example that the good old Mauser is the way to go.
Even I, being a huge fan of the cartridge pick-up and controlled feed of the Mauser 98, was thoroughly surprised at how well they work.
Example: An accquaintance of mine, who owns a .500 Shuler that is similar to mine, was having problems with his extractor. The claw contour was too large and didn't clip around the rim too well, and certainly didn't grasp the rim as it should.
For comparison, we pulled my bolt and clipped a shell onto the face of the bolt with the rim under the extractor. The fit was so good, you could hold the catridge with the bolt hanging off the end, and, if holding the bolt, the extractor could keep the cartridge attached and straight at any angle. I bet the bolt could be cycled with the gun upside down!
Now thats controlled feed!