What do you think of the new cartridge? I’ve yet to see / shoot one but as with everything new and improved, I wonder how much of the introductory hype is marketing vs factual. After a century and a half of developing metallic cartridges, manufacturers must be running low on superior performance comparisons.
I do like the comparative simplicity of straight wall cartridges, both from a reloading perspective and feeding from a box-type magazine. But neither of these virtues are game changers. It does work in the AR-15 platform. I don’t know if it will be accurate enough for 300 yards shots with the only bullet weight offered so far, but that’s not to say a lighter or sabot projectile couldn’t improve accuracy at distance. The COL looks to be similar to a 30 carbine so it certainly could develop into a rifle & pistol cartridge.
https://en.wikipedia.org/wiki/.400_Legend