Get 2 boxes of 3" magnum shotshells, any size - 00, #4, #2 etc.
Hammer those babies through to break in the springs and then try the other shells.
My M1S-90 has always fed the Federal 00 Reduced Recoil Tactical loads without a single FTF.
CMOS
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GOA, TSRA, LEAA, NRA, SAF and I vote!
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