The least fussy cartridge is without a doubt the 6mm BRA.
The most fussy are every single old cartridge with a shallow shoulder angle, lots of body taper, and too much brass length to actually work properly with heavy-for-cal bullets at magazine length.
I still remember when the 6.5 Creedmoor came out, and those people were talking about how the 260 remington was superior.
Then the 6 Creedmoor came out, and they said the 243win was superior.
Now the 22 creedmoor is releasing, and they are all saying the 22-250 is superior.
Every single one of these cartridges has a shallower shoulder and more body taper, which we
KNOW is worse for virtually every internal ballistic metric. The newer creedmoors can beat every single one of them in the accuracy/precision department, with light or heavy bullets, but yet people still act like it's open for discussion.
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