Jeezo Pete.... seems that the folks in the know recommend keeping your loads at 6,000psi and lower to prevent frame cracking on these light Flues 20ga guns. Easier said than done. I don't see any 20ga loads in any of my books that are that low pressure. My 1200fps loads using PB in AAHS and STS hulls are 10,300psi. I don't find anything usable in the Lyman 2,3, 4 and 5th editions.
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