300 weatherby imr 7828 ssc

In my german MK 5 300 WBY I use 7828 and 168 TTSX working at 87.0

Fed 215GM primers in WBY Brass at 3.560"
 
If you think you must use 7828 then 84-86grns but you will be at a disadvantage to about 80grns H4831sc mainly in the accuracy department.
 
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