American Rifleman - November 2010 - (Page 38)

TECHNICAL LOADING BENCH SPEER 180-GR. DEEPCURL IN 10 PERCENT BALLISTIC GELATIN Revisiting Speer’s Big-Game Bullets BY AARON CARTER, Managing Editor peer’s ri e bullet lineup is one of the most all-encompassing in today’s marketplace. As such, its parent company, ATK, has maintained a relative hands-off approach since acquiring it in 2001. For 2010, though, in an effort to strengthen and rede ne the Speer brand, its diverse big-game bullet product lines are being reorganized, and there’s a new projectile, DeepCurl, which is set to replace at least one of its hallmark offerings. S Past Designs Since Speer’s beginnings, its bread-and-butter bullet has been the Hot-Cor, which is created by pouring molten lead-alloy into a gilding-metal jacket. The technique avoids a lubricated, pre-formed core and eliminates trapped air, preventing oxidation, and since both oxidation and lubrication contribute to jacket-core separation, the at-base projectile typically maintains 70 to 75 percent of its original weight. Even 80 percent weight retention isn’t uncommon. Because of this, Hot-Cor bullets are suitable for a variety of game that can be taken by a given caliber if a bullet of suf cient weight is selected. Best of all, Hot-Cor projectiles are relatively inexpensive. Speer’s Boat Tail bullet, which features a heel tapered at an angle upward of 13 degrees for an increase in ballistic coef cient, does not use the same manufacturing process as its Hot-Cor sibling. As such, its expanded diameter is greater, and weight retention and penetration are slightly less; however, the tapered jacket with a heavy shank reduces the chance of the jacket rolling back on the heel and thus jacket-core separation. Typical weight retention is 65 to 70 percent. Speer Boat Tail bullets are best used on game for which deep penetration isn’t as critical, maximum tissue damage is desired, and long-range shots are probable. The latter is where the increased BC attens trajectory and resists wind de ection better than Hot-Cor bullets. Like the Hot-Cor, the Boat Tail is competitively priced. Hunters desiring better and more consistent terminal performance than that offered by Hot-Cor and Boat Tail bullets have options in the Mag-Tip and Grand Slam. What about the famed Trophy Bonded Bear Claw and Trophy Bonded Sledgehammer? As of this year, the TBBC and TBSH are now under the Federal Premium banner, so they’re no longer Speer products. Manufactured via the Hot-Cor process, but featuring a full-length (protected nose), tapered gildingmetal jacket with a thicker shank than a Hot-Cor of identical weight and caliber, the Mag-Tip maintains upward of 85 percent of its original weight for deep penetration. Its tougher construction also enables its use in high-velocity cartridges; however, because it has internal uting and a large meplat, Mag-Tip offers more reliable expansion at lower velocities. The cost of the Mag-Tip’s pro le is a loss of continued on p. 40 Photo by author 38 N OVEMBER 2010 WWW.AMERICANRIFLEMAN.ORG http://WWW.AMERICANRIFLEMAN.ORG

Table of Contents for the Digital Edition of American Rifleman - November 2010

American Rifleman - November 2010
Contents
Editor’s Letter
Armed Citizen
Standing Guard
President’s Column
Readers Write
News, Notes and Ephemera
Questions & Answers
Loading Bench
Expanding Bullets: Really Work
Laser On Board: The New Bodyguards
Election 2010: Had Enough? Vote Freedom First!
Political Report
Election 2010: Races To Watch
The Model 94 Rides Again
Spanish Broomhandles
Blaser: The Evolution Of German Hunting Rifles
Arms Of The “Chosin Few”
Walter R. Walsh: An Amazing Life
Dope Bag: Data & Comment
ILA Report
Regional Report/Member Info & Benefits
Programs & Services
I Have This Old Gun

American Rifleman - November 2010

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