Big and slow is perhaps a relative term. My original question excluded DG hunting and was focused on mainly North American big game and non-DG, African Plains game. It should have implied also that it was not focused on North American DG such as Brown bears and Grizzly bears.
I am not sure I would call the 375HH big and slow. But, I guess that depends on if I am comparing it to the 243 or the 458, lol. The 375 is a great PG cartridge but is really the 243 of the Dangerous Game cartridges. It and the 9.3mm are the smallest of the legal for DG options. But, it is also applied quite successfully to larger North American big game such as elk or moose, etc. For those applications it might be big and slow when compared to a 7mm Mag or 300WM.
This sort of discussion quickly devolves into 50 shades of grey instead of a true black or white argument. While Keith was very involved in pistol cartridge development, this discussion is about rifles and hunting. When I think of big and slow, I am thinking of rounds like 450 Bushmaster, 350 Legend, 444 Marlin, 45-70, etc. Most fling a bullet in excess of 200g wt at speeds in the low 2000's or teens. They may or may not expand reliably and depend more on a large bullet diameter and heavy mass to do their job. Light and fast is also somewhat relative but for discussion purposes, might be defined as rifle rounds capable of muzzle velocity in excess of Mach 2 as a minimal and ideally over 2.5 Mach and bullet weights that are less than average for a given application. i.e. For a deer rifle, if the 165-180g 30cal is the average, then a 100-130g might be light and the 220-300g might be heavy.
