Wash44, did you measure the lands or the grooves? I think the only accurate way to measure bore diameter is to cast the bore. Which I've never done. I've been loading for over 30 years and I've never paid attention to it. My thought is barrel manufacturers make .44s in a range that match the bullet diameters. So if your bore is at the large end and you fire a bullet at the small end, and vice-versa, you'll still be ok. You might find better accuracy with a given brand because the diameters match better which might explain the accuracy but there are too many other variables (powder, charge, primers, seating depth, crimp, etc). If you make your own cast bullets, well, that might be a different story. A small bullet in a big bore, gas escapes, accuracy suffers. A big bullet in a small bore and pressure increases.
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