No barrel length will change this.
True, but if you think in terms of minutes of angle (MOA), it is ever so slightly easier to estimate lead on a crossing target if the barrel is longer. Enough to be significant? Probably not.
Think about a dove crossing at 40 yards (120 feet), flying at 60mph. 60mph is 88 ft/sec. A load at 1200fps will take 1/10 of a second to travel from the shooter's position to the point at which the dove will cross the line of the shot. 1/10 of 88 feet is 8.8 feet, so there's your lead. If the barrel (or ray) is 40 yards long, it would be (theoretically) easier to maintain the correct lead with a 40 yard barrel than with a 28" barrel. So, theoretically, a longer barrel helps with lead. In practice, I think it's hooey. Advantage is probably swing weight and gun balance on that kind of target.
