Wow! Either "Babe" is now known as "boatbum101" or boatbum has a memory like an old dog! I can't remember my own load stats without pencil and paper let alone another guys with that kind of detail!

Mike,

It's hard enough to take accurate throat measurements with the proper tools (example Amazon.com: Starrett S831EZ Small Hole Gauges Set (4 Pieces ): Industrial & Scientific ) and near impossible using the calipers.

Try this. First clean the cylinder really good using a stiff bronze brush and any cleaner such as Hoppes #9. You can even chuck the brush in your drill as long as you only use it on the cylinder. There can be some really hard deposits of carbon/lead.

When satisfied all holes are clean try dropping a .452 lead bullet through the holes. Try a .451. Do they fall through with only gravity? .451 does but the .452 doesn't? Have to push it just a little with a rod?

If the .452 falls through with gravity only then the throats are without doubt oversized.

If you are not seeing leading in the first 1-2" of the bore after shooting .452 lead bullets the odds are your throats are not grossly oversized.