Ammunition
"A real tack driver that gives me all the confidence I need when it comes time to take the shot." — Don Conoly [Georgia]
  • Rifle: Mark V® Accumark
  • Caliber: .30-378 Wby. Mag.
  • Range: 275 yds.

Over half a century ago, Roy Weatherby began his career in the firearms industry as a “wildcatter,” developing his revolutionary ideas about rifle cartridge performance and design.

At the time, many of the industry’s “experts” were promoting the idea that optimum performance was a result of pushing big bullets at relatively slow speeds. Roy, however, believed just the opposite. It was his opinion that the faster a bullet traveled, the better—the flatter it would shoot, the less it would drop, the harder it would hit—the better its terminal performance. It was a concept that would spawn many an argument among ballistics experts, gun writers and in many a deer camp. But as people began to hear about and experience Roy’s notion firsthand, those questions, concerns and doubts were quickly laid to rest. Soon, the entire hunting world would know what Roy had always believed — generate enough speed to create hydrostatic shock in the animal and the result will be more one-shot kills.

Today, our ammunition remains true to the concept Roy developed in the 1940s. At the same time, our ammunition also takes advantage of the latest in controlled expansion bullets which are capable of harnessing the higher velocities to create a cartridge that provides the ultimate in penetration, large wound channels and more one-shot kills. Nothing shoots flatter, hits harder or is more accurate than.

All Weatherby® rifles are guaranteed to shoot a 1 1/2" OR BETTER 3-shot group at 100 yards from a cold barrel when used with premium (non-Weatherby calibers) or Weatherby factory ammunition. Together, the Weatherby system (premium ammunition and rifle) forms the flattest shooting, hardest hitting, most accurate combination in the industry today.

The Anatomy of a Cartridge

We start with Norma® Precision brass, the finest that money can buy (handloaders also tell us it’s the finest for reloading). Then we add premium grade primers and bullets from the top names in the business—Hornady®, Nosler® and Barnes. The result is that each Weatherby Magnum cartridge is produced with the precision of handloading...with the blistering speed and downrange power to deliver the opportunity for more one-shot kills. In virtually every case, no other commercially-produced ammunition provides the Maximum Point Blank Range of Weatherby. Nothing shoots flatter, hits harder or is more accurate out of the box than a Weatherby.

A unique double radius Venturi shoulder design - Increases the velocity of escaping gases without increasing the pressure within the cartridge. This results in higher velocity within standard pressure ranges.

Brass - We use Norma Precision brass, offering CNC-machined primer pockets produced to matchgrade specifications...the finest that money can buy.

Specially-designed Primers - Provide positive ignition of the large powder charged found in Weatherby Magnum ammunition.

Powder - Norma® High-Grade Premium Powder is used in all Weatherby Magnum Ammunition to deliver maximum attainable velocity and energy. Each lot of powder is tested to assure consistency and to achieve the lowest standard velocity deviation from shot to shot, improving accuracy. Gives the non-handloader handloaded performance and accuracy.

Bullet - Weatherby® Magnum Ammunition offers a variety of premium grade bullets that are carefully selected for specific hunting applications. To meet varying needs, we proudly load the renowned Barnes TSX™, the popular Nosler® Partition®, Nosler Ballistic Tip®, Nosler Accubond®, and the Hornady® Interlock®. And new for 2009, we also now offer the Barnes TTSX™, an exciting new polymer tipped bullet that pushed the velocity threshold to a whole new level. Whichever you prefer, it has been ideally matched to maximize the potential of Weatherby Magnum Ammunition.

Barnes® TSX®

Upon its introduction, the Barnes X Bullet™ was generally regarded as a quantum leap in bullet design, retaining virtually all of its weight upon impact and delivering superior terminal performance with lighter weight bullets. TSX takes the X bullet to the next level. Get greater penetration and more one-shot kills with the world’s deadliest hunting bullet-the TSX.

  • Specially designed nose cavity opens instantly into four petals on impact. Offers faster expansion than traditional lead-core bullets. Retains virtually 100% of original weight
  • Razor sharp edges deliver lethal cutting power and deeper penetration through thick skin, flesh and bone
  • 100% copper construction
  • Precisely positioned rings relieve firing pressure, allowing the TSX to be loaded at higher velocities
  • Reduces fouling for easier cleaning of the bore
    • Barnes TSX Weight Retention = 99-100%
      Wby. Caliber .240 .257 .270 7MM .300 .300 .30-378 .30-378 .338-378 .340 .378 .416 .460
      Weight (GR) 85 100 130 140 165 180 165 180 225 225 270 350 450

      Barnes® TTSX® - NEW!

      Barnes’ new TTSX takes the proven performance of their Triple-Shock X bullet design and adds a streamlined polymer tip. The result is a blistering fast projectile that pushes the velocity threshold to a whole new level. It features the same 100% copper body with multiple rings cut into the shank to deliver gnat’s-eyelash accuracy and “dead right there” performance-but with an added polymer tip that boosts the ballistic coefficient and improves long-range ballistics. The tip and a re-engineered nose cavity provide even faster expansion.

      • Light for caliber, extremely high velocity and flat trajectory
      • 100% lead-free bullet body constructed of copper with 99-100% weight retention
      • Grooved for lower pressures
      • Higher ballistic coefficient
      • Razor sharp edges on petals deliver lethal cutting power and deeper penetration through thick skin, flesh and bone
      Barnes TTSX Weight Retention = 99-100%
      Wby. Caliber .257 .270 7MM .300 .30-378
      Weight (GR) 95 80 100 120 130 130

      Hornady® Interlock®

      A tried and true hunting bullet, the InterLock promises more mass, energy and momentum at impact for greater stopping penetration. Hornady’s pioneering secant ogive design offers a high ballistic coefficient with maximum bearing surface for greater stability.

      • Retains more mass and energy for deep penetration and large, consistent wound channels
      • Secant ogive design offers a high ballistic coefficient with maximum bearing surface for greater stability
      • Cannelure provides accurate and consistent crimping, and also works with InterLock ring to ensure the jacket and core remain locked during expansion
      • The raised InterLock ring is embedded in the bullet’s core, ensuring the core and the jacket is locked in one piece during expansion to retain mass and energy
      Hornady Interlock Weight Retention = 70-80%
      Wby. Caliber .224 .240 .240 .257 .257 .270 .270 .270 7MM 7MM 7MM .300 .300 .300 .340 .340 .340 .378
      Weight (GR) 55 87 100 87 100 100 130 150 139 154 175 150 165 180 200 225 250 270

      Nosler® Ballistic Tip®

      The more you hunt, the more you realize just how unpredictable and unforgiving each situation can be-changing winds, skittish game, challenging shots. That’s why Nosler engineered the Ballistic Tip hunting bullet to be very predictable and extremely forgiving...a proven performer for more than 20 years.

      • A polycarbonate tip resists deformation in the magazine and initiates expansion upon impact. The tip is color-coded by caliber
      • Fully tapered jacket and special lead alloy core allows controlled expansion and optimum weight retention at all practical velocity levels
      • Ballistically-engineered Solid Base® boat tail configuration combines with the streamlined polycarbonate tip for extreme long-range performance
      • Heavy jacket base acts as a platform for large diameter mushroom and prevents deformation during firing
        • Nosler Ballistic Tip Weight Retention = 50%
          Wby. Caliber .240 .257 .270 7MM .300 .300 .30-378 .30-378 .338-378
          Weight (GR) 95 115 140 150 165 180 165 180 200

          Nosler® Accubond®

          A serious hunting bullet designed to typical Nosler standards. AccuBond represents the most advanced bonded core bullet technology to date. The result is a bullet that flies true, penetrates deep and retains its weight-and won’t cause extensive barrel fouling. The benchmark by which all bonded core bullets will be measured.

          • A polymer tip resists deformation in the magazine and initiates expansion upon impact
          • Fully tapered, heavy alloy jacket is bonded to the special lead alloy core through a proprietary process designed for controlled expansion, deep penetration and 60-70% weight retention
          • Totally concentric, impact extruded jacket bonds completely to the bullet core for extreme accuracy
          • Ballistically engineered, the Solid Base® boat tail jacket acts as a platform for large diameter mushroom and prevents bullet deformation during firing
          Nosler AccuBond Weight Retention = 60-70%
          Wby. Caliber .257 .270 7MM .300 .30-378 .338-378 .340
          Weight (GR) 110 140 160 180 180 200 200

          Nosler® Partition®

          Favored the world over for its superior penetration and bone-crushing stopping power, the Nosler Partition provides the ultimate in accuracy, controlled expansion and weight retention in any caliber, on any game, and in any situation. Nosler Partition is truly the standard of excellence and value in big game bullets.

          • Fully tapered jacket ruptures instantly at the thin jacket mouth. Gradual thickening along the bullet’s axis controls expansion and curls the jacket uniformly outward at all velocities
          • Lead alloy dual-core construction provides superior mushrooming at virtually all impact velocities
          • Integral partition supports the expanded mushroom and retains the rear lead alloy core
          • Enclosed rear core retains more than half the original bullet weight for deep penetration
          • Special crimp locks in the rear core section add strength to resist deformation under the pressure of heavy magnums
          Nosler Partition Weight Retention = 65-70%
          Wby. Caliber .240 .257 .270 .270 7MM 7MM .300 .300 .300 .30-378 .338-378 .340 .340 .375
          Weight (GR) 100 120 130 150 140 160 150 180 200 200 250 210 250 250
Ballistics Specs PDF

Trajectory Comparison

.30-378 Wby.
Bullet B/C Path of Bullet
(Above or below line-of-sight of rifle scopes mounted 1.5" above bore)
Wt. Grains Bullet Type 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds
130 Barnes TTSX .350 2.12 2.85 0.00 -7.18 -19.61
165 Barnes TSX .398 2.40 3.10 0.00 -7.40 -19.60
165 BST .475 2.40 3.00 0.00 -7.40 -19.50
180 BST .507 2.50 3.10 0.00 -7.50 -20.00
180 Accubond .507 2.50 3.10 0.00 -7.50 -20.00
180 Barnes TSX .453 2.66 3.38 0.00 -8.12 -21.77
200 Partition .481 3.20 3.90 0.00 -9.10 -24.30
.270 Wby
Bullet B/C Path of Bullet
(Above or below line-of-sight of rifle scopes mounted 1.5" above bore)
Wt. Grains Bullet Type 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds

Energy Comparison

.30-378 Wby.
Bullet B/C Energy (Foot-Pounds)
Wt. Grains Bullet Type Muzzle 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds
130 Barnes TTSX .350 4039 3372 2807 2327 1917 1567
165 Barnes TSX .398 4362 3719 3161 2675 2251 1882
165 BST .475 4488 3930 3435 2995 2603 2253
180 BST .507 4676 4126 3634 3193 2797 2441
180 Accubond .507 4676 4126 3634 3193 2797 2441
180 Barnes TSX .453 4513 3921 3398 2935 2524 2160
200 Partition .481 4434 3877 3381 2938 2541 2188
.270 Wby
Bullet B/C Energy (Foot-Pounds)
Wt. Grains Bullet Type Muzzle 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds

Velocity Comparison

.30-378 Wby.
Bullet B/C Velocity (Feet per Second)
Wt. Grains Bullet Type Muzzle 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds
130 Barnes TTSX .350 3740 3417 3118 2839 2577 2329
165 Barnes TSX .398 3450 3186 2937 2702 2479 2266
165 BST .475 3500 3275 3062 2859 2665 2480
180 BST .507 3420 3213 3015 2826 2645 2471
180 Accubond .507 3420 3213 3015 2826 2645 2471
180 Barnes TSX .453 3360 3132 2916 2709 2513 2324
200 Partition .481 3160 2955 2759 2572 2392 2220
.270 Wby
Bullet B/C Velocity (Feet per Second)
Wt. Grains Bullet Type Muzzle 100 Yds 200 Yds 300 Yds 400 Yds 500 Yds
Features Bullet Type Velocity 200 yds Energy 200 yds Trajectory 300 yds Trajectory 400 yds
.257 Wby. Mag. 115 gr. Nosler Ballistic Tip 2952 fps. 2226 ft.-lbs. -4.98 in -14.57 in
.25 WSM 115 gr. Nosler Ballistic Tip 2639 fps. 1778 ft.-lbs. -6.40 in -18.60 in
.25-06 Rem. 115 gr. Nosler Ballistic Tip 2639 fps. 1778 ft.-lbs. -6.58 in -19.26 in






.270 Wby. Mag. 130 gr. Nosler Partition 2892 fps. 2415 ft.-lbs. -5.19 in -15.28 in
.270 WSM 130 gr. Nosler Partition 2810 fps. 2275 ft.-lbs. -5.60 in -16.30 in
.270 Win. 130 gr. Nosler Partition 2610 fps. 1965 ft.-lbs. -6.50 in -19.10 in






.300 Wby. Mag. 180 gr. Nosler Partition 2826 fps. 3193 ft.-lbs. -5.51 in -16.03 in
.300 WSM 180 gr. Nosler Partition 2590 fps. 2680 fps. -6.60 in -19.10 in
.300 Win. Mag. 180 gr. Nosler Partition 2460 fps. 2410 fps. -7.40 in -21.90 in

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