Hodgdon shows 59g of H4350 as a max load with a Sierra HPBT and they do not indicate a compressed charge either. Some brass will be slightly different from others in capacity and if you are using new brass that can make some difference. If you are not showing any pressure signs at the charge you are at I would slowly keep working up.
Just went to my scale and loaded 59g H4350 in Remington brass. 59 is definitely a compressed charge. Don't know why the manuals don't say that.
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