long time
IME there are no standard pistols chambered in 9x19 that are "safe" for Major Nine.
My Major Nine pistol is a hardchromed Witness running a (super)tight-chambered Nowlin barrel hard-fit by Mr. Bob Cogan of Accurate Plating & Weaponry.
Since '95.......
(a few other minor tweaks were performed by me)
Most any 9x19-chambered pistol will run Major PF ammo; question becomes "for how long?"
Safety first.
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"all my ammo is mostly retired factory ammo"
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