Charts like the one in the link are good, but should only be used as a rough guide. The only way to know for sure is to chronograph loads in your gun. Remember, all guns are different, and it is not at all unusual to see significant differences in velocity between guns with equal barrel lengths. Nor is it unusual to see one individual barrel shoot faster than another barrel that is slightly longer. The actual velocities someone else may get could vary +/- as much as 50-100 fps in a different gun.
Environmental conditions are a factor as well. If you read the fine print those velocities were recorded at 0 degrees Farenheit. Some powders are more temperature sensitive than others, but if that test had been done at 90 degrees the velocities would have all been somewhat faster. Depending on the powder used, it could be significant. The military is pretty good about using powder that is consistent across a wide range of temperatures, I wouldn't expect much more than 20-30 fps difference in hot weather, but with many loads used in hunting rifles it could be 100 fps or more faster in hot weather.
