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Taz's Master is correct - two different bullet diameters. Most companies that offer the dual cylinder option just bore the barrel for use with the smaller diameter .22 Long Rifle ammo. It does no harm to shoot lead bullets that are .001" "oversize".
The dirty little secret with these guns, however, is revealed by the chronograph. There is very little to be gained, velocity-wise, with the .22 WMR over the .22 Long Rifle in a revolver. Get some of the light bullet, high velocity .22 LR fodder and you will match what the .22 WMR will do, velocity-wise, from a revolver. You'll save a lot of money on ammo as well.
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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