Looking for load advice for accura mr x 50 cal.

I have the the MRX 50 caliber. I found that Blackhorn 209 with a 330 grain ELR with 90 grains by volume shoots li the same hole at 50 yards and shoots a little over a half inch at 100.
 
I’m shooting the Parker production 300gr ballistic extreme, with a harvester crushed rib sabot. Weighing BH 209 at 85gr, with a magnum rifle primer. Did load development with a scope before putting my Williams sights on. Had 3 shots at 150 I could touch with a dime.
 
I’m shooting the Parker production 300gr ballistic extreme, with a harvester crushed rib sabot. Weighing BH 209 at 85gr, with a magnum rifle primer. Did load development with a scope before putting my Williams sights on. Had 3 shots at 150 I could touch with a dime.
Congratulations and thanks for sharing
 
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