Hello, just purchased a rock river arms .308ar and am also new to reloading. I have already purchased 300 hornady amax 155gr and 168gr projectiles. I realized after I got home that they do not have a cannelure, which from researching on this site seems to be important on a semi-auto due to possible bullet setbsck from recoil. I have a Lee factory crimp die, can I use this to put a light crimp on the amax bullets? Or should I return the amax and go with something like the SST that had a cannelure?