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April 3rd, 2012
 The impressive new Lapua Rimfire Service Center opens in Mesa, Arizona on April 24, 2012. Patterned after the world-renowned Lapua Service Center in Schönebeck, Germany, this facility gives American shooters the same opportunity to test various types and lots of rimfire ammunition, in their own firearms, under ideal conditions. This assures that customers can purchase not only the best type of ammunition for his or her particular rifle, but also the specific lots of ammo that perform best. Experienced competitive rimfire shooters know that the ability to select a particular lot of ammunition that performs best in their firearm(s) means a world of difference in a match.
Until now, the ability of a shooter to do this vital testing was dependent on the small quantities of ammunition of various lots on hand, generally without any guarantee that a vendor could provide more of whatever lot turned in the best results. Lapua will maintain an inventory of approximately two million rounds of rimfire ammunition on site — a wide variety of different types and grades, and many different lots. Lapua states that: “Our goal is that you, the shooter, will be able to purchase sufficient quantities of the best ammo for your needs. In future matches, you’ll be able to know that the ammo you take to the line is truly the very best.”
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CLICK “PLAY” to HEAR Adam Braverman TALK about Lapua’s New Arizona Rimfire Test Center:
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[haiku url=”http://accurateshooter.net/Video/bravermanmemo.mp3″ title=”Braverman Voice Memo”] |
High-Tech Electronic Targets in 100m Test Tunnel
At the heart of Lapua’s operation is a new 100m test tunnel. Fully instrumented with state-of-the-art Meyton electronic targeting systems, the Mesa facility offers the unique ability to test ammunition at both 50 meters and 100 meters, simultaneously with a single string. As the bullets pass through the screen at 50 meters, a group will appear on the first targeting screen. As the bullet continues its flight downrange, it will also be picked up on a second screen at the 100 meter line. This approach allows the shooter to see, instantly, which ammunition performs best at both 50m and 100m distances.
Shooters are encouraged to visit the new Rimfire Service Center. Testing is by appointment only, with a $50.00 range fee. For more information, visit www.Lapua.com or email lapua [at] nammoinc.com. The Lapua Rimfire Service Center is located at 4051 N. Higley Road, Mesa, AZ 85215, on the grounds of Nammo Tactical Ammunition. The Lapua Service Center, just 20 miles from Phoenix Sky Harbor Int’l Airport, is easy to reach by major roadways. Not far away, in the general Phoenix area, you’ll find a wide variety of hotels, restaurants, golf courses, plus the outstanding Ben Avery Shooting Range.
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April 3rd, 2012
 AccurateShooter.com’s Facebook Page has a new look. Our posts and shared links are now organized in a two-column “time-line” format. This new look is part of the Facebook layout update that went into effect this weekend. It may seem a little confusing at first because content now alternates between left column and right column. But you’ll still find the newest stuff at the top, and the older entries at the bottom. Just shift left to right as you read the posts in timeline order from top to bottom. You can still comment on our Facebook entries, or share our posts on your own Facebook “Wall”. If you enjoy what you find on our page, be sure to click the “Like” button, located at the lower RIGHT corner of the header photo. This helps us deliver our content to more Facebook users.
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The Rifle on our New Facebook Page Header
 We have also added a bold new Facebook header that lets you know that you have arrived at the right place. Up top is a beautiful rifle originally built by Richard Franklin for Forum member Barry O. (aka “TheBlueEyedBear”). This rifle, chambered in 6mm Super LR (a shortened .243 Win Wildcat), features a BAT SV Action, Bartlein 5R barrel, and a handsome walnut LowRider stock. The LowRider is a Richard Franklin design, now produced by Shurley Brothers Custom Rifles. The Shurley Brothers’ operation has been licensed by Richard Franklin to produce his popular hunting, varmint, and long-range stock designs. As did Franklin, Shurley Brothers offers a wide range of wood options, from Rutland laminates to deluxe fancy woods such as: Curly Maple, Cherry, Myrtle-wood, Bastogne Walnut, and Turkish Walnut. If you want a laminate of fancy woods, such as a Maple and Walnut combo, Shurley Brothers can also build that. |
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April 3rd, 2012
GS Arizona, a top small-bore and centerfire shooter, uses the 6XC cartridge in some long-range matches. He has tried a variety of different types of brass for this cartridge, including necked-up 22-250 brass and Norma 6XC brass from David Tubb’s (Superior Shooting Systems). German’s measurements reveal significant differences in water capacity, as well as neck-wall thickness.
6XC Source Brass Dimensions
Case Capacity and Pressure Issues
GS has noted significant variances in capacity among the different “flavors” of brass. Norma-headstamp 6XC brass has 49.3 grains of H20 capacity, while Norma 22-250 brass holds only 47.8 grains of H20. Third-generation Tubb-brand 6XC brass is somewhere in the middle, with 48.6 grains of capacity. The tester did not have a chance to measure the high-quality Lapua 22-250 brass introduced in 2010. NOTE: These differences in case capacity are large enough that you MUST adjust your load to the brass type.
 We ran a 6XC QuickLOAD simulation with 115gr bullets and H4350 powder. QuickLOAD predicted that the observed difference in case capacity can result in pressure differentials as much as 4,500 psi! In other words, if you switch from Norma 6XC brass to a lesser-capacity brass type, your pressures could rise 4,500 psi (using H4350 and 115gr bullets).
We recommend sticking with the Norma 6XC brass. It is available from DavidTubb.com for a reasonable $69.00 per 100 cases. These days, that’s cheaper than many other types of premium imported cartridge brass.
Neck Thickness and Chambering Issues
German noted that the different types of available brass varied quite a bit in neck-wall thickness — from 0.0121″ (Norma 22-250) to 0.0140″ (Tubb 3rd Gen). Consequently the diameter of loaded rounds also varied. Depending on the brass you chose, your loaded rounds could be 0.267″ at the neck or 0.271″ (with no-turn brass). That’s a huge difference and it’s something you need to take into account when you have your chamber cut for a barrel. For a cross-the-course rifle, you might want a chamber with at least .003″ total clearance over a loaded round. Obviously, to achieve that clearance, you’ll need to set chamber dimensions base on your preferred type of brass.
NOTE: The research for this story was conducted in 2010. Dimensions may have changed with more recent production, so you should double-check the case capacity of your own 22-250 or 6XC brass.
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