I don't know that you can achieve that goal of 7000 psi. I see a 1 1/4 ounce load of lead using 29gr of 7625 and folded crimp in the Rem Blkltr hull, it develops 5900 psi. 1 1/4 ounce of Bismuth in that hull with 29gr of 7625 develops 5900 but uses a roll crimp. My guess, and it's just a guess is you would be around 8000 psi with 29gr of 7625 and Nice Shot, probably lower if you use a roll crimp. You would have to send it out for testing to confirm it.
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