I recall a similar situation with a cast load that Griff or Grizz asked about, in which his stats did not match up with the velocity that QL produced. I just entered the bullet from the tables and expected the length to be correct. Possibly, that bullet length was the culprit.
So... after extensive use and experimentation with QuickLoad:
1) If the bullet length and other critical factors match up with what you are actually using, the QuickLoad computing engine is marvelously close to accurate for muzzle velocity and other factors;
2) BUT - NEVER take QuickLoad's bullet tables for granted. They are good for an approximation as has been said before. But you are working with a full deck ONLY if you actually measure the exact bullet that you are loading. You can pull it up on the QuickLoad tables, but you must mic or "caliper" the bullet length, diameter, and COAL (aka COL - Cartridge Overall Length) settings used.
3) All QuickLoad tables can be edited. When you note discrepancies in the bullet length (especially), you can edit it from the QuickLoad program interface without resorting to editing the text tables. This is much safer, anyway, since you can inadvertently corrupt the text tables unless you really know what you are doing.
IN FACT, SHOWN ABOVE AND BELOW IS A CORRECTED BULLET CONFIGURATION FOR THE ROUND SHOWN, based upon my measurement of the actual bullet. I will change it again if the loaded COAL is different, depending upon where the crimp is found.
As you would expect with good professional software, any changes you make are reflected in the other data, such as how deeply the bullet is seated within the case, after you edit the "Bullet Length" and "Cartridge Length" (COAL) data.
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