I found this from an earlier post from me on this site:
Running the 147gn ELD-M's through 28" Lothar Walther barrel, .010" off LaG, ahead of 56.5gn of Retumbo, Norma brass and BR2's. Getting average of 3017fps with ES of 14 / SD of 7. Accuracy is running in the .3-.4's.
In Mar 2018 I tried the 147gn ELD-M, RL-26, Norma brass, BR2's, oal: 2.6000"
54.0gn 2956/3012/3005 (avg. 2991fps, ES:26/SD:30.5, accuracy: .540") cleaned barrel before this load.
54.5gn 3059/3054/3041 (3051/18/9.29/.924")
55.0gn 3086/3083/3078 (3082/8/4.04/.6915")
55.5gn 3107/3104/3103 (3104/4/2.08/.425")
This was my initial run with RL-26 and I was thoroughly pleased. I tried it again, about a week later, same load info as above, same weather conditions pretty much and I experienced sticky bolt and it just seemed to be producing more pressure.
I was out of RL-26 at this junction and pretty much decided to stay with Retumbo for this cartridge. Not sure what happened, whether it was the powder or the barrel. I may try it again, not sure. RL-26 and Retumbo really make the 6.5-284 Norma with 140+gn bullets shine!