I'm using a K624i with AMR reticle on my ELR .300NM rifle.
I purchased it a few years ago, mostly for the reticle. The AMR reticle has 0.2 mil hashmarks for both elevation and windage portions of the reticle, with a pretty extensive x-mas tree reticle for holdovers. The reticle may look busy in pictures, but it doesn't feel near as busy in real life.
Khales has a great reputation for tracking, and I'm pretty familiar with their scopes having 3 of them (all different reticles). Their internal elevation is not as extensive as other scopes, such as some of the more modern NF scopes. I don't believe this is any deal breaker, not with x-mas tree reticles and prism devices such as the Charlie TARAC.
I don't believe Khales makes the AMR reticle anymore, it must not have been too popular, which is a shame. I wish they made an updated version of that reticle, off the top of my head I would prefer a small dot in the center of the reticle. If I was to buy a scope today with what's currently available, I would strongly consider another Khales, perhaps with the SKMR-4 reticle.