Not sure exactly what you are calling a "whiz bang", but I have used badlands bullets as close as 30 yards at impact velocity of 3500fps. Shot placement on that one was not ideal (nephew shot into some brush), but bullet was very lethal.I shot a whitetail scrub buck at 10 yards with a 215 hybrid and it worked perfectly anybody used a whiz bang bullet closer than that?
Maybe if you execute them that's when the failures start??
I have used hammers as close as 100 yards on elk and was very pleased with its performance.
Conversely, I have used a "long range" lead core bullet at 100 yards on elk with very poor results. MV was around 2800fps on that load and that bullet exploded on that elk at 100 yards. Made the most ridiculous mess I have ever seen of the guts and wasted a ton of meat. Shot placement was almost perfect double lung and there was shank that passed all the way through, but blood trail was nearly nonexistent. I was really lucky to find that animal. There must have been some pretty significant fragmentation on impact given how far back I found tissue damage.
That experience resulted in my interest in mono bullets and I haven't looked back since. Now that I am shooting "tougher" bullets that don't splatter, I have actually trained myself to start shooting more into the shoulder than I used to. Meat loss with both hammer and badlands bullets has been very minimal in my small handful of kills with them. I have one rifle that really likes the Barnes LRX so I will likely be using that one this year at some point as well.