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Old August 16, 2011, 12:56 PM   #2
Jim Watson
Senior Member
Join Date: October 25, 2001
Location: Alabama
Posts: 14,109
I don't think there is any reasonable way to know the chamber pressure of a load picked out of the air or off the internet, or even out of most manuals.

But to get you in the ballpark, that is a full grain BELOW the Lyman STARTING load for a 150 JSP at 32,000 CUP.

So I am betting you are well below the pressure of the 7mm the gun was originally built for and have a safety margin even with Spanish gunsmithing.
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