Cannelure bullets are made tube feed rifles. They are also are made for heavy recoil bolt rifles. Bullets can get bumped back in magazines from recoil.
45acp and 9mm need crimped so the bullet does not get jammed back in loading. This will cause a jam or a high pressure firing. The only round I do not crimp are shot in my single shot rifles. Those only get neck sized with a bushing die.
The Lee crimp dies ($15) are so easy to use. I crimp all of my other hand loads and I crimp all my AR loads 5,56mm, 6.8mm, 450B and 308. You do not have to have a cannelure groove to maintain good crimp on a bullet.
