Yesterday I did a little preliminary testing with RE23 in my PRC because I was able to find an 8lb jug. I was loading single rounds, 1 grain apart, in charge weight. Surprisingly enough, both the Nosler 142 ABLR and the Sierra 130 TMK shot under 1.5" @ 400yds. Keep in mind that the 3 shot groups had 3 different charges!
The 142 ABLR NEVER shot well in this rifle. I just finished reloading some additional cases and I'm eager to see if the results are repeatable.
BTW - I'm using the much maligned Hornady brass because that's all I have at the moment. After prepping the cases I weigh each case and then place them in the box in order of weight. This way every group is (usually) shot with cases that weigh exactly the same. Not sure if this helped but it sure couldn't hurt.