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Ranger94,
When you slugged your barrel, did you push the bullet all of the way through and then measure it? If so, then what you measured is the SMALLEST diameter in the bore. Often, that is located where the barrel is screwed into the frame. There is a little compression there from the tight fit in the frame, and it showes up most on large bores like the .45s. Beyond there (towards the barrel) the bore may be larger. But, you don't want that, especially if you shoot lead bullets, because the tight spot swages the bullet down to be smaller than the bore beyond, so gas leaks by the bullet after it passes the tight spot and that causes leading. (Sometimes that leading can be avoided with gas checked bullets.)
So, what you really want to do is push a bullet just part way into the bore from the muzzle end, then pull it back out and measure it. Then, push a bullet all of the way through and measure that. If the muzzle measurement is the same or smaller than the all-the-way-through measurement, then you do not have a constriction to worry about. But, if there is a constriction, then you either need to fire-lap to remove it or stick to jacketed (or maybe gas-checked lead) bullets.
Once you have the bore staying the same or getting smaller from the forcing cone all the way to the muzzle, then you want to make sure that your cylinder throats are at least as big as the bore near the cylinder, and it would be better if they were about 0.001" larger. That way, the bullet si always getting squeezed-down slightly, and gases never get the chance to leak by.
SL1
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