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Good writeup. I expect that 9.5x57 has a way to go yet, in loads.
My 9.3x57, with less case capacity (smaller shoulder dia.) and very light moderate pressure signs runs 2,300fps with 270's and 2,200fps with 286gr. - using both BLC2 and H4895. Varget will do likewise, but is slower than 4895 in this case. The BLC2 is the slowest of them all.
Thanks Daryl, yes I agree, when we did the test firing I was amazed at how "blown" out the shoulders were, till the fire forming they were shallow. it almost looks Ackley Imp, so yes I think there is plenty left in the "old girl" 
I will keep you posted as it progresses.
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