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GUNS Magazine September 2011 Digital Edition - Page 35

already with the abrasive, called Final Finish and TMS (Throat Maintenance System—bullets only) are available from Superior Shooting Systems. NECO 108 ARDMORE WAY, BENICIA, CA 94510 (800) 451-3550 WWW.GUNSMAGAZINE.COM/NECO SUPERIOR SHOOTING SYSTEMS P.O. BOX 1211, CANADIAN, TX 79014 (806) 323-9488 WWW.GUNSMAGAZINE.COM/SUPERIORSHOOTING-SYSTEMS-INC WICKEDGRIPS.COM Wickedgr@WICKEDGRIPS.COM The ONE. The ONLY. The ORIGINAL. Creating custom, one of a kind grip sets for the 1911, RUGER, BERETTA, and the SIG 238 • JEff JOhN • Q: fire Lapping In the May issue, John Barsness talks of using fire-lapping bullets to remove rust (page 39, left column). After spending 30 years in the Marine Corps as an ordnance officer, I would like to know what “fire-lapping bullets” are. Neil Goddard Fuquay Varina, N.C. Q: Auto vs. Sixgun A: The NEcO Economy abrasives kit allows you to “roll your own” fire-lapping bullets. The kit contains the lab grade abrasives in paste form, steel rolling/imbedding plates, 10 soft lead slugging bullets for checking progress and a thorough instruction manual. The kit contain enough compounds to fire-lap 10 firearms and is available in your choice of caliber. Fire lapping is a process where A: bullets are treated with a mild abrasive and then fired down the bore to smooth-up rough spots in the rifling. It is especially useful in barrels dark from corrosive priming, which foul quickly. Even in new barrels, it can allow more shots to be fired between cleanings and faster clean up. The NECO website has a history of the pressure-lapping process often called fire-lapping today, and offers tips on when it should be employed and what the benefits are. Fire-Lapping kits with abrasives to make your own fire-lapping bullets or bullets ready for handloading are available from NECO. Bullets or ammunition treated I’m now the proud owner of my first “cowboy gun,” a Ruger S/S Blackhawk Bisley, .45 Colt, 5-1/2" barrel, complete with an extra cylinder in .45 ACP. The use of .45 ACP in a revolver has set me thinking and scratching my head. Comparing a typical 1911 with a 5" barrel to my revolver, is there an improvement in ballistics when the same cartridge is used in a revolver, compared to the semiauto? What percentage of improvement might be observed when there is no semi-auto mechanism to be operated by the cartridge? Art Schubert Reno, Nevada Actually, the action of the semi-auto doesn’t “use up” any velocity, and the “closed” chamber should actually cause a slight increase in velocity over a revolver, due to the revolver’s barrel/cylinder gap. By chance I had a 5" S&W 1917 laying on my desk when I got your note, Art. So I dug out a 5" Springfield Armory 1911 and a few rounds of Federal 230-grain Hi-Shok and 230-grain .45 ACP ball rounds and adjourned to my backyard here. Over the chronograph, the 1917 averaged around 825 fps with ball and 758 with the Federal. The 1911 averaged 855 with ball and 836 with Federal. So in my less-than-scientific experiment, the revolver’s cylinder/ barrel gap did cause a bit of gas loss, reducing velocity by a tad. Nothing to worry about though, as any of those velocities will perform just fine in the .45 ACP.—Roy Huntington From the highest grade woods, to our signature custom inlays, We are a TRUE Custom Grip Maker! Be sure to check out our new handgun accessory company at: GRIPWERX.COM 810-412-4037 Due to the volume of mail received, GUNS cannot offer a personal reply. Please e-mail your question to ed@ gunsmagazine.com or snail mail to: GUNS Q&A, 12345 World Trade Dr., San Diego, CA 92128 35 WWW.GUNSMAGAZINE.COM

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