be very interested in hearing how you get on @300_BLK. I have a 264 win mag that's waiting for some load D. And like you I find myself scratching my head at some of the listed loads powders which seem to only 3/4 fill the case, if that. Also wonder about running slower powders and closer to case capacity. Was thinking of playing around with RL25 or 26 with 140 gn pills. Nosler data might be worth a look too.
https://load-data.nosler.com/load-da...hester-magnum/
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