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These days it seems every gun "reviewer" offhands it at steel at 15 yards and it's allActually, @kmk1012 was right in that if you took a single 6" gun and fired it from Ransom rest for groups, then cut off two inches of barrel, and fired for groups again, the 6" version would be more precise than the 4" version if any statistically significant difference was found. Which it might not be without firing more rounds than was any fun at all. However, if you use two different guns, even of the same make and model, one with a six inch barrel and one with four inch, and fire from Ransom Rest, there's no predicting which would be more precise. This is because the differences between individual guns are large and the average drop in precision from 6" to 4" guns is small. And that's eliminating the human factor. By the time you add in the fact that different barrel lengths gives different sight pictures and different sight pictures affect different people's ability to shoot the gun differently, the effect of barrel length on precision of human-fired guns of various barrel lengths is really unpredictable.
I used to spend a lot of time reading Ransom Rest tests back in the 70s and 80s when gun magazines ran a lot of these. To summarize two decades, when someone tested a new model of a top notch revolver such as a Colt, SW, or Ruger in .357 mag or .44 mag, they would usually test three barrel lengths and many ammo brands. The best ammo brands with the six inch guns could usually get five or six shot groups just under 2" at 50 yards. The best ammo brands with the four inch guns would either get the same or very slightly less precision. Too small to be statistically signifcant. However, the difference did usually show up in the 2.5" guns. These typically had group sizes of 3 to four inches with the best ammo choices. And ammo mattered more. I especially noticed that the most precise ammo in the snubby .357 guns was normally a 158gr load, not a 125 or 110 gr load. I speculate that the short barrel of a .357 snubby cannot optimally stabilize a short bullet, but can optimally stabilize the longer 158 gr bullet.
Normally if it was any revolver other than a Colt, SW, or Ruger in the Ransom Rest tests the groups would be much larger. Sole exception-- Dan Wesson. The Dan Wessons usually shot better than the Colt, SW, or Ruger of equivalent barrel lengths.