Update:
A quick trip to the range revealed:
Ginex LRM primers seem to work great and seat a little tighter that the Fed215s. (Another 6.5 Norma shooter I know is using CCI BR2s and RL 26 with great results.)
These are 5-shot groups with Retumbo, Ginex LRM, 140gn Nos BT, COAL 2.98":
55.7gn: 2865...
Update:
57.6gn Retumbo with Fed215s and Nosler BTs was too much. Primers were backing out a little and mushrooming against the boltface. Accuracy was great but the etching on the boltface said no, stop. I'm guessing the load was originally developed with an old batch of Retumbo. It was noted...
I'm looking to develop a 6.5x284 Norma load with the 142 ABLR. I've had phenomenal success (sub moa) with 57.6gn of Retumbo and the 140gn Nosler BTs @ 2989 fps ave. Primers are flattening a bit but no obvious pressure flags. Lapua brass. I have yet to try the ABLRs but getting very close to a...