50m or so is a devastating test for any bullet.
Your bullet was at close to its maximum velocity. It takes a pretty tough bullet, monometal or H core, along with heavy jackets for reliable performance at such close range.
I'm not saying they don't work, but they're at and often beyond their design parameters.
I'm not dissing you personally, but most people just don't do enough research on their components, especially bullet types.
Many of them are highly specialized for special applications, such as long range performance, close range, heavy bones, soft animals like varmints and Coyotes, the list goes on.
We're lucky to have such a wide spectrum to choose from.
Pinpoint accuracy is always nice, but very seldom is it the reason an animal gets away, if the shooter is doing their part, even with bullets that reliably group 3inchs at point of aim at 100yds.