I have been doing a lot of research recently on differant shotgun tools that have been tried over the years. One item that comes off often is "Duck Bill Spreaders". There have been several versions over the years, but they all seem to origanaly date to the early 70's. Crane Lake is often cited has were they originated and they are cited has being used by the SEAL's in Vietnam and by the Air Force Security Forces.
In each case they are cited as being regulated for use with #4 buck shot. This at first struck me has odd, but has I continued to research it, each of the referance manuals that I have found from the early 70's saw #4 has the best all around load for LE/military shotguns.
I finaly was able to secure a A&W Diuverter from Bill DeShivson TFL and had it installed by kingjoey on a 18 1/2" 590 barrel. Pics below.
I found a large amount of info on the A&W in "The Police Shotgun Manual", by Roger H. Robinson, 1973. Mr. Robinson includes many high speed photos that were provided by A&W Engineering of shot loads coming out of the A&W. Once I check some copywrite issues I will try to include them. Those photos show the divreter appairing to be very efficent at what it does. The accompaning data also outlines Diverter Pattern Control.
For example:
At 10 yards you have a 7 1/2" H x 29" W pattern with #4
At 30 yards you have a 25" H x 96" W pattern with #4.
this does what it was intended to do, in that it increases the chance of hiting a target. Terminal effects are a seperate subject.
They also claim a 22% reduction in recoil. They also claimed that the diverter would diminish the muzzle flash to that of a .38 special at night.
Finaly to my surprise they found that dispite the fact that a slug is larger then the mouth of the diverter, you can fire them through it. The result is two grooves on either side of the slug, and a resulting reduction in yaw.
That's it for now. I should be posting some range results this week.
In each case they are cited as being regulated for use with #4 buck shot. This at first struck me has odd, but has I continued to research it, each of the referance manuals that I have found from the early 70's saw #4 has the best all around load for LE/military shotguns.
I finaly was able to secure a A&W Diuverter from Bill DeShivson TFL and had it installed by kingjoey on a 18 1/2" 590 barrel. Pics below.
I found a large amount of info on the A&W in "The Police Shotgun Manual", by Roger H. Robinson, 1973. Mr. Robinson includes many high speed photos that were provided by A&W Engineering of shot loads coming out of the A&W. Once I check some copywrite issues I will try to include them. Those photos show the divreter appairing to be very efficent at what it does. The accompaning data also outlines Diverter Pattern Control.
For example:
At 10 yards you have a 7 1/2" H x 29" W pattern with #4
At 30 yards you have a 25" H x 96" W pattern with #4.
this does what it was intended to do, in that it increases the chance of hiting a target. Terminal effects are a seperate subject.
They also claim a 22% reduction in recoil. They also claimed that the diverter would diminish the muzzle flash to that of a .38 special at night.
Finaly to my surprise they found that dispite the fact that a slug is larger then the mouth of the diverter, you can fire them through it. The result is two grooves on either side of the slug, and a resulting reduction in yaw.
That's it for now. I should be posting some range results this week.