I would give them a try in a pistol with Magna Port, or other "holes in the barrel", but I would NOT shoot them in ANY type of pistol that had a "Comp".

I found a couple of boxes that I had loaded for the 44 Mag dated 1976 [yes, ninteen seventysix] a few weeks ago, so I have been using them at least that long. They are loaded with No9 shot and 7.5gr of Unique in 44 Special cases.