Accessories

I wouldn't stake my life on threaded devices being with us from now on, but I submit that no one has shown us anything that even comes close to replacing them. After all, a screw is just a wedge around an axis and is incredibly efficient.

Galco Gunleather has introduced a new Facebook page. Here's what they had to say about it:

Gunsmiths need two types of measuring instruments, direct and indirect (or comparison). The indirect, or comparison, instruments include tools found in the caliper family, such as inside, outside, and hermaphrodite calipers, and dividers. Direct measuring devices include the rule, various micrometers, and dial-faced measuring tools.

Every gunsmith needs a good vise, but not everyone has the money to buy one. Here are two you can build yourself, with updated dimensions for components.

Crimson Trace will produce a limited run of Lasergrips and Laserguard products in pink variations for Smith & Wesson J-frame and Ruger LCP handguns.

Roger Eckstine of Gun Tests/GunReports.com details the important functional aspects of the 24-7 Series Weathershield Windbreaker, $100.

Austin Miller from GunReports.com takes a minute to talk with Josh Waldron, CEO of Silencerco at the first-ever Silencers Are Legal Shoot at Elm Fork Shooting Range in Dallas, April 28.

California State Senator Leland Yee is moving to outlaw the “bullet button,” an AR-15 accessory that enables “fixed” magazines to be removed quickly with the tip of a bullet or other pointed object.

Hunters and shooters who buy a Redfield Revolution riflescope from May 17 to July 8 can receive a $30 rebate. In addition, Redfield Rebel binoculars purchased from Gander Mountain May 24-July 8 are also eligible for a $20 rebate.

Interchangeable choke tubes have been a feature for smokepole enthusiasts since Winchester Firearms created the system in 1959. The first experiment ended in 1965 because of functioning problems, but the Winchoke system introduced in 1970 took hold and is considered the grandfather of choke development. Today, it is hard to find a shotgun that does not feature some kind of interchangeable choke system.

Perhaps a little trip back to the physics classroom is necessary at this time. For those who still remember the days of Shotgun Chokes and Ballistics 101, we request a little indulgence.

When the powder charge sends the shot column down the barrel, it reaches the choke and is forced to squeeze together before exiting the muzzle. That constriction is called radial force. As the shot column leaves the barrel, gravity and wind resistance immediately take over and attempt to force the pellets inside the column to spin and flare off. The tighter the pellets are squeezed together by radial force inside the choke, the more the pellets hold together over a longer distance and produce a tighter pattern.

Constriction of the chokes is measured in thousandths of an inch and, in general, breaks down to the following measurements that are subtracted from the bore diameter of the barrel: Cylinder, .000; Skeet, .005; Improved Cylinder, .010; Modified, .020; Improved Modified, .030; Full, .040.

For example, in our patterning and handling tests, we selected a Browning Model XS Citori 12-gauge over and under with 32-inch barrels that was reviewed in previous editions of Gun Tests. The interchangeable chokes from the various manufacturers were all designed to fit the Browning. We checked the bore measurement of the XS with a bore gauge and the reading was .740. The constriction of all the choke tubes was subtracted from that figure to determine their bore diameter.

One more part of the classroom review states that in most cases the improvement in the pattern on a target at 30 yards over the widest pellet spread with a cylinder choke is about 10-13 percent with skeet; 15-17 percent with improved cylinder; 25-27 percent with modified; 30-33 percent with improved modified; and about 35 percent with a full choke. Students can now close their books.

It should be noted in reading through our test that performance results will vary depending upon individual shotguns and some shooters make their choke selection based on tube qualities other than patterning, such as ease of use; weight; and even appearance.

All of these individual factors are a matter of personal preference and help drive the quest to find the right combination of choke tube length and constriction that produces the optimum pattern performance. As one smoke-pole veteran said: "Whatever works for you, works for you — Don't mess with something that works."

In our test, we examined the results using both an improved cylinder and modified choke. The ammunition used was Winchester AA Xtra-Lite 2.75 inch Target Loads with one ounce of No. 71/2 shot and 2.75 dram equivalent of powder producing an average 1180 fps muzzle velocity.

All of the chokes in the test were fired at a 30-inch circle on a paper target placed 30 yards downrange. We noted that there was very little deviation in the overall pattern of pellet strikes on the paper, with all the chokes tending to produce slightly more strikes on the left side of the circle rather than on the right. This result probably is a factor of gun fit for the shooters, rather than choke fit in the barrel.

We also tested all the chokes on clay target presentations on a couple of different sporting clays ranges. While target breaks can vary according to the skills of the shooter more than because of the effectiveness of the chokes, we also used the "feel-good" factor to judge how well the tubes worked on clays in our evaluation.

Also, the collective information as to the internal dimensions of revolvers, i.e., their dynamics, has been expanded to areas not many shooters have investigated, either because they didnt know about them, or they just didnt care. As long as most of the shots hit where they were supposed to things were left alone. But what if they could be improved? What if a somewhat faulty set of dimensions or a rough bore of a revolver or auto pistol could be altered by the shooter to improve accuracy?[IMGCAP(1)]To that end we acquired a kit from Beartooth Bullets, P.O. Box 491, Dover, Idaho 83825, (208) 437-1865 (or at beartoothbullets.com, $49 plus shipping & handling). The kit included a box of 100 lapping bullets in your choice of caliber, two steel plates, a four-ounce can of lapping compound, a huge bolt that fits into your loading press where the dies screw in, and a technical manual (mailed separately). The manual was called Technical Guide, and was written by Beartooth headman J. Marshall Stanton in clear, unambiguous English, which was a revelation after having struggled through the somewhat foggy NECO manual. The subtitle for this manual is, A Comprehensive Guide For Attaining Unsurpassed Performance Using Cast Bullets. Sold separately for $15, the manual goes into great detail on how to do just that.We had been working with several revolvers that shared the same problem. The barrel was too tight where it was screwed into the receiver. This area often gets compressed from normal assembly, resulting in a choke that pinches or resizes the bullet. The gun cant shoot its best because the bullet is now too small for optimum contact with the rifling during the rest of its passage through the barrel. While this can happen to both cast and jacketed bullets, and holds true for rifles as well as handguns, we will concern ourselves in this report with cast bullets fired from one revolver and one 1911 pistol, both of 45 caliber. The revolver was a Cabelas (Uberti) 4.6-inch barrel in 45 LC, and the 45 auto was the recently tested Taurus PT-1911, which had a strong tendency to collect lead.

Gun Tests adviser and trainer Brian Hoffner, a 30-year veteran of the Houston Police Department, has gotten into the fashion business with his new American Tactical Apparel line of clothing.