Heinmot,
I believe we discussed this earlier. Try removing the holdopen and fire some rounds without it. If the gun now functions reliably, you've got your culprit.
115gr. S&B must be able to work the toggle, as it's one of the more spicy loads, so I tend towards the ammo not being the main source of your problem.
My money is still on the holdopen. Is the pistol chromed/nickeled inside? This may have caused the holdopen to rest just a tad too high.
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