mje
Member
I have a Magnum mini convertible, and I've noticed certain .22LR rounds result in setback and a jammed cylinder. After some experimentation, it seems the biggest offenders are the rounds with nickle plated cases, like the CCI Stingers and shotshells. The Aguila SSS rounds jam too, sometimes.
I'm guessing the problem is the nickle plating. Here's my hypothesis: Normally, when you fire a .22LR cartridge in a revolver, the case expands slightly under pressure and grips the cylinder walls. But the nickle plated shells don't do this, as the nickle plating has a much lower coefficient of friction. The Aguilas have a very short case (.22 Short sized) and also have less grip.
Anyone else notice more setback jams with some cartridges than others in these guns? I haven't noticed any problems at all with any ammunition in the .22Mag cylinder.
I'm guessing the problem is the nickle plating. Here's my hypothesis: Normally, when you fire a .22LR cartridge in a revolver, the case expands slightly under pressure and grips the cylinder walls. But the nickle plated shells don't do this, as the nickle plating has a much lower coefficient of friction. The Aguilas have a very short case (.22 Short sized) and also have less grip.
Anyone else notice more setback jams with some cartridges than others in these guns? I haven't noticed any problems at all with any ammunition in the .22Mag cylinder.