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Many of the files on this page are in Acrobat .pdf format for easy viewing and printing. Download Acrobat Reader free of charge by clicking the above link. x PRODUCTS x c DTAC ammo & components c . BSC Bearing Surface Comparator . . INSTRUCTIONS . DOWNLOADS . PRICING . c BOOKS c SpeedLock c Reloading Tools c 6XC c CS Springs [all] c AR15 CWS c AR15 CS Springs xxx Target Shooting Gear . xxCompetition Grips xx Rapid Fire Timer xx Shooting Hat xx 4-Way Buttplate xx Sight-Line Tube x.c Tubb Tactical Gear Tactical Vest c TUBB 2000 [rifle and accessories] c Extractors c Model 70 Cocking Piece c Remington 700 Recoil Lugs c Competition Slings c Send E-Mail c Download Product Information and Instructions c ORDER [shopping cart] c ORDER CATALOG c c . TIPS from David .     CONTACT orders/information Call 806-323-9488 Fax 806-323-9483 Superior Shooting Systems Inc. 800 N. Second St. Canadian TX 79014 e-mail: CLICK HERE	x "Click on any link below to view that specific product page. You'll also be able to download information, instructions, and specifications." x Bearing Surface Comparator c xx 0 0 00Prices and specifications are subject to change without notice. "Our bearing surface comparator allows the handloader to segregate bullets by yet another means. Unlike some criteria, though, this is truly effective. The results are proven on paper in long range competition."   x CLICK ON THE PHOTOS FOR A LARGER IMAGE x 000   Another step toward perfecting ammunition Grouping bullets together that are more nearly the same helps attain the goal of eliminating as many variables as possible. The Superior Shooting Systems Inc. Bearing Surface Comparator [BSC] provides an effective way to measure the surface of the bullet which is in contact with the bore of your barrel. Small differences (even a few thousands) in bullet bearing surfaces generate enough more (or less) friction that the velocity and pressures of the load are affected. Uniforming bullets into a consistent measurement range will allow your standard deviation and extreme spreads to become closer, and, ultimately, shoot smaller groups on target. The BSC is designed as a caliber-specific instrument with different caliber attachments (sleeves/bushings) available that fit from .222 through .338 diameter (caliber) bullets. A caliber set consists of two different tapered bore diameter sleeves. One sleeve attaches to the stem of the supplied dial indicator and is held in place by a 5/32 allen-head screw. The other (stepped) sleeve is set upon the granite base (with the sleeve's larger diameter step on the bottom). The bullet to be measured can be placed into this base sleeve either nose up or nose down. To get repeatable accurate results, the base sleeve should be perfectly centered under the dial indicator's stem-mounted sleeve. When setting up the BSC, keep the allen head screw which attaches the dial indicator to the red mounting finger somewhat loose until you put a bullet into the bottom sleeve. Let the dial indicator stem with the top sleeve attached then slide onto the protruding end of the bullet, and keeping light pressure from your index finger on top of the stem (pushing downward on the bullet), tighten the allen head to set the dial indicator in the proper position. This ensures top accuracy and squareness of the BSC device. After the BSC instrument is correctly set up, it usually takes a few minutes to become familiar with the fit and feel and pressure of the bullet into the base sleeve. Once this is accomplished there are several usage techniques which work equally well in measuring the bullet's bearing surface. Dropping the dial indicator about one-tenth (0.100) of an inch onto the bullet is a technique that works well. This can be repeated a couple of times to ensure a consistent measurement (this also helps to seat the bullet fully into the bottom sleeve). A different technique is to gently let the indicator sleeve slide onto the bullet and then gently bump the exposed (top of indicator) stem of the indicator to assure that the sleeve has fully seated (using your index finger for the bump initiator). When putting the bullet into the bottom sleeve, a small amount of downward pressure helps assure that the bullet is seated properly. It is recommended that you segregate and group a range of bullets of about 0.003 inches into the same category. The BSC design allows for the tip of the bullet to be up or down when measured. This is strictly a matter of individual preference -- either way allows for equal efficiency and accuracy. Whichever way you choose, however, continue measuring the same -- all nose up or all nose down for that group of bullets. The BSC can also be used with loaded ammunition to check a round's frontal bearing surface to base of the case measurement. This measurement allows one to segregate the overall lengths of the loaded rounds (take care to be certain that your primer is fully seated below the rim of the case). Phone 806-323-9488, FAX 806-323-9483, or order ON LINE ORDER Available in the following calibers .22 (.224), 6mm (.243), .25, 6.5mm (.264), .270, 7mm (284), .30 (7.62mm), .338   DOWNLOAD BROCHURE BACK TO PAGE TOP XX xx   00Prices and specifications are subject to change without notice.
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