@Daniel Cary the reason some people do not like Kynoch is because they believe the ammo is faulty, neutered, and sub-standard performance. (It is not)
The 1921/1926 Kynoch data that is reprinted in Graeme Wright’s book is rather insightful. The short story is this In summary:
1.) The original loads for about everything relied upon now extinct stranded cordite.
2.) The velocities published were embellished. Typically about 35fps-50fps bolder than reality.
3.) Almost all proof barrels were 28”. Whereas most gun barrels were 24”-26”. With the original stranded cordite loads you were losing 25-35fps per inch of barrel less than 28”.
One such example is this. The regulating load for a 470NE is really about 2050fps-2075fps, but a lot of people assume its 2150fps-2200fps.
So in light of the above, these original rounds in the original guns are the source of all the verified data that were covered by all the greats in their African Hunts. The largebore Kynoch loads in real-world use were sufficient in the popular calibers from 450-400 all the way through 577NE. Certainly 500 Jeffery is in that camp too.
The problem comes in today when someone that has either hot-rodded their loads, or has a modern powder that generates much more recoil than stranded cordite to achieve the same velocities, tries the original kynoch loadings. They then assume something is defective or neutered with the original load when in fact, the problem is the modern loads are not correct and are overpowered. Does it matter in a magazine rifle? Probably not. Does it matter in a double rifle? Yes, yes it does.
