i see this phase slung around for certain cartridges but what attributes or Ballistically makes a cartridge inherently accurate?
Fat cases on the shorter side, pushing a slightly small caliber for the "fat" powder charge it is sitting on, and, using "Long Skinny" higher BC projectiles...(even though 2600 feet per second may be enough.)
Well made, Faster twist barrels, and plenty long for powder selection.
243 is a necked down 308, and, essentially built for speed of projectiles. Flat shooting means accuracy for most hunters.
6.5 CM by Hornady is a necked down 30 TC (26 TC?), and is an "efficient" cartridge...based on high BC bullets, fast twist, not blazing speed.
A 300 WM would need a long heavy bullet to reach the high BC projectiles used in the 6.5 CM, meaning a 200+ grain bullet, BC .6?
And, at significant more recoil.
A .277 or .284 using the 6.5CM formula of high BC, fast twist, "fat" speed, would be the next place to look for accurate lethality. Hence the new US battle rifle may be 6.8
And, quite accurately lethal.