Back-bored Shotgun Barrels? 

Shot string doesn't matter. Ed Lowry long ago proved it: www.randywakeman.com/lowryshotstring.pdf . The highest percentage loss to pattern at 65 yards is only 4.1%.

Lowry's study was limited by the technology of 1979. It only uses one method for collecting data on a moving target, a piece of paper. Data collection, analysis, and external shotgun ballistics have come a long way it the past 4 decades. The study focuses on where the pellets are in flight, and collects no data from where the pellets landed. This experiment is limited to data collected from the Z and Y axis, ignoring X. Data was only collected using a passing target paper target limited to the Z and Y axis. It is hard to tell the difference on crossing shots, but the effectiveness of a short shot string on ground targets is undeniable. If 2 patterns have the same width and height, then the pellets will land closer together in the pattern with the shortest shot string.

Hardly. One of Lowry's first projects was reconstructing entire shot strings. The whole point is pattern thinning at range vs. crossing targets, the worst scenario. Shot moves far faster than the targets we shoot at, which moots the entire discussion. Shooting at water tells you nothing about patterns or shot string, and the notion that shot string means anything against cripples on the water is completely bogus. It is a completely settled matter: slow motion photography proves Burrard was right as was Lowry. Simple wind drafting allows Full chokes to have much shorter shot strings down range than open chokes. www.randywakeman.com/ShotshelPelletBehavior.htm

@@RandyWakeman You are correct. There is no denying shot strings exist in various lengths. What is important or irrelevant to a large degree is how long it takes that shot string to completely pass by the target. How far does that target moves during the passing of that shot string (movement will be the greatest at a 90 degree angle to the gun). And,what is the speed of the target,the speed of the shot as it intersects the target,and the amount of time it takes for the shot string to completely pass by the target. The length of the shot string is difficult to know without expensive equipment, and of course is governed by a number of variables I.e. shot size, velocity,distance to the target,climatic conditions, quality/type of choke being used etc. The shorter the shot string the better of course,and the farther away the target is the longer the shot string will be. For most targets being shot at normal distances the target will not move enough to evade a well centered and evenly dispersed shot pattern.

It does nothing significant other tthan making your gun uglier and more annoying.

*All it takes is aftermarket chokes.*

@@RandyWakeman you are right but I feel like there is no way they should continue to make a product that's completely useless like that.

I owned a Pet Rock, which was also useless. Since it was guaranteed to be useless, I had nothing to complain about.

It is all documented on my website, in great detail.

Randy Wakeman So do recommend replacing the factory Browning DS chokes to aftermarket extended chokes? Which brand of chokes do you recommend? All of the guy around here speak as if Briley IS The Brand!! Please help as I just purchased a Browning 727 Pro Sporting and haven’t shot it yet.

@@nmhvactech5474 based on his test, it seems that he preferred Trulock, I wonder where DS chokes are made at?

I've tested Briley as well: www.randywakeman.com/BrileyTakesontheBrowningDSChokeSystem.htm . Trulock is generally the best, your money back if not satisfied, but regardless you still have to pattern your gun with your ammo.