This I can tell you, the E.C, Tuner that Eric Cortina sells out of Texas really works. The service is second to none and the product is well worth the small cost. I say that in when you work up loads it is much faster and much more cost effective, as you or anyone who shoots one they are not cheep ,especially now with the cost of supplies. I know LRT can be finicky but at the cost it is worth the gamble. play with your charges, and if you have an EC Tuner, load. Find what distance you rifle likes off the lands, load only 2 of each and do a ladder test, once you find the load do the same with the tuner, start at 0 and work up on # at a time, you will see it start to work. I love shooting never had it for the AR as grew up with a bolt back in the late 50's .loved it the A R is a wonderful killing machine for the services but never had a calling for it. First exposer was in Texas at boot camp in 1966. When I got out went home to Washington State picked up my Weatherby's Browning's and moved to Montana, the rest is history. There was a Old Rancher I got to know that lived out in the Break country, I was 24 he was 90,wore Convers Tennis high tops as his feet hurt and no shoe strings ,he took a liken to me and me him, he could tell some real stories as he Homesteaded his land in 1910, Pete