jepp2,
You say,
The gage pins may give you minor diameter AND NOT THE MAJOR.
In a revolver the Diameter of the Cylinder Bores or Plus .001 is all you'll usually need.
When the bullet passes through the cylinder into the barrel, THE CYLINDER BORE SIZE RE-SIZES THE BULLET TO THE TRUE CYLINDER SIZE.
If the MAJOR BARREL diameter is larger than that, you're screwed, unless you have the cylinder bores opened up by a gunsmith, and then try again.
I have a model 29-5 44 mag with all six cylinder bores .433, but I'm assuming S&W barrel size is around .430, I'll size lead bullets to .433 and .434 to try accuracy tests.
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