I once gave Federal a call in order to ask what the PSI was on their Estate Super Sport Competition loads in 1 1/8 oz. 1145 FPS. However, I did not receive any definitive answer. Just that they were right around 10,000 PSI. I seem to remember that Tom Roster in an article once said that there was no correlation between lower feet per second loads and low chamber pressure in modern loads. I agree whole heartedly that RST is the only manufacturer that really caters to the vintage shooter who definitively needs low PSI loads.
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