RE16 should be just fine, I'd start a ladder at 52gr and ladder up .5gr at a time to a max of 54.5gr. Thats with a 150gr NBT seated at 3.080 COAL
If your COAL is shorter than that, then start a little lower, make sure that you stop shooting any further rounds, if you strike excess pressure signs, you'd likely see heavy bolt lift on a fired round, and/or ejector stamps on the case head, both of these signs are too hot and you'd need to back off about 1gr of powder charge.
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