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Old June 15, 2012, 09:13 PM   #4
mykeal
Senior Member
 
Join Date: October 8, 2006
Location: Northern Michigan
Posts: 2,772
Hawg is correct. While it's not the only reason (you might go back and read his post again; he never said it was the only reason) the vast majority of the time a cylinder turn ring on a SA revolver is due to letting the hammer down from half cock. Just think about how the action works and you can see how it happens.

In half cock the bolt is retracted into the frame and held there against the trigger/bolt spring by the bolt leg being on the hammer cam and pushed up. the cylinder is, of course, free to rotate in a clockwise direction. If you then pull the trigger out of the half cock notch and let the hammer down it will allow the bolt leg to fall as the hammer drops, raising the bolt through the frame and onto the cylinder surface; any rotation of the cylinder back or forward into battery is not resisted until the bolt drops into the first cylinder stop notch it encounters. The trigger/bolt spring will hold the bolt head on the cylinder surface, creating the turn line the whole time.

The only way to prevent the turn line when dropping the hammer is to manually position the cylinder in battery before dropping the hammer and hold it there until the hammer is fully down.

Yes, a turn line can be caused by imperfect timing, but in that case it's an incomplete line - just a short line leading into the stop notch, not a complete line around the cylinder. Unless, of course, the bolt leg is badly bent or broken.
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