Vlad,
I shoot my twist steel Parkers all the time. That said, you have received sound advice on having the gun checked out. I have been flying by the seat of my pants. A Parker as old as yours would have been used with mercury primers and they are the cause of pitting in most barrels. If your barrels show no pitting I would be suspect. They could have been "cleaned up" which might have reduced the barrel wall thickness to a dangerous leval. I have not checked the thickness of the barrels on my Parkers and have relied on gut feeling about if they have been "messed with" or not. I have an 1881 lifter Parker with twist barrels that receives loads in the 8,000 psi range at rounds of sporting clays without a hiccup. I have used factory WW Xtra Lite 1 oz loads through it at sporting clays and in the field. Mind you, I prefer to reload in the 5,000 psi range with this twist Parker using IMR 7625.
Good shooting, Harry
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