338 WBY RPM

(2 customer reviews)

$79.00$109.00

The 338 WBY RPM (Rebated Precision Magnum) is based on the Weatherby 6.5 RPM necked up to accept a 338 caliber bullet. The 338 RPM was designed to take advantage of Weatherby 6-Lug action to get magnum performance in a 5lb rifle. The large body diameter, low body taper, and 35-degree shoulder mean that case capacity is greatly increased, leading to higher velocities.

CARTRIDGE SPECS

Bullet Diameter: .338 (8.6mm)
Common Reference: 338 Caliber
Max Case Length: 2.57”
Production Start: 2022

BALLISTIC INFO

View Additional Info Below

SKU: 338RPM Category: Tag:

Description

Ammunition Shipment Restrictions

Must be 18 or older to purchase rifle ammunition. Shipping not available to P.O. Boxes, International Addresses, AK, CA, HI, MA, CT, IL, NJ, NY nor DC residents. Residents of DE, KS, OH, and WA may have additional restrictions. All ammunition is shipped domestic ground and an adult signature is required. We do not accept returns on ammunition.

Maximizes the magnum potential of the lightweight Mark V 6 Lug action

Introduced in 2022 the 338 WBY RPM (rebated precision magnum) maximizes the magnum potential of the lightweight Mark V 6 Lug action. The goal was to fit a large caliber bullet into a lightweight backcountry rifle that could take down all of North America’s big game. The 338 RPM is based off of the 6.5 RPM necked up to accept a .338 caliber bullet. The case features a large body diameter, low body taper, and 35-degree shoulder creating a larger powder capacity, leading to higher velocities.

The 338 RPM is an extremely efficient cartridge and maintains velocity even with 18” barrels which are featured on the Mark V Backcountry lineup.

LEARN MORE

Episode 43 - The New 338 WBY RPM
On Our Mark Podcast

Episode 43 - The New 338 WBY RPM

The Weatherby Team sits down to talk about the all new 338 WBY RPM. Listen as they share stories on the challenges and triumphs of developing the new cartridge, hunts and animals taken so far and much more.

LISTEN NOW

BULLET INFORMATION

Barnes® TTSX®

A 100-percent copper bullet with a polymer tip to boost ballistic coefficient to improve long-range ballistics and provide fast expansion. The four razor sharp cutting petals double the bullet diameter that wreak extensive internal damage and produce massive wound channels. The TTSX is extremely accurate and has great expansion.

  • Common Reference – 338 Caliber
  • Bullet Diameter – .338" (8.6mm)
  • Bullet Weight – 225 gr.
  • B/C (G1) – .514
  • Max Case Length – 2.57“

Barnes® TTSX®

A 100-percent copper bullet with a polymer tip to boost ballistic coefficient to improve long-range ballistics and provide fast expansion. The four razor sharp cutting petals double the bullet diameter that wreak extensive internal damage and produce massive wound channels. The TTSX is extremely accurate and has great expansion.

  • Common Reference – 338 Caliber
  • Bullet Diameter – .338" (8.6mm)
  • Bullet Weight – 225 gr.
  • B/C (G1) – .514
  • Max Case Length – 2.57“

VELOCITY DATA (FPS)

Bullet WeightMuzzle100 yds200 yds300 yds400 yds500 yds
185 gr.310028762663246022662080
225 gr.280026232453229021321981

ENERGY DATA (FT LBS)

Bullet WeightMuzzle100 yds200 yds300 yds400 yds500 yds
185 gr.394733972913248621091778
225 gr.391734383007262022721961

BULLET TRAJECTORY (INCHES)

Bullet Weight100 yds200 yds300 yds400 yds500 yds
185 gr.1.4“-6.2“-18.3“-37.1“
225 gr.1.8“-7.6“-21.8“-43.6“

Hornady® InterLock®

The InterLock® features an exposed lead tip for controlled expansion and hard-hitting terminal performance. A secant ogive design — one of the most ballistically efficient profiles ever developed. The raised ring inside the jacket is embedded in the bullet, combined with the one-piece core, keeps the core and jacket locked together during expansion to retain mass and energy.

  • Common Reference – 338 Caliber
  • Bullet Diameter – .338" (8.6mm)
  • Bullet Weight – 225 gr.
  • B/C (G1) – .397
  • Max Case Length – 2.57“

Hornady® InterLock®

The InterLock® features an exposed lead tip for controlled expansion and hard-hitting terminal performance. A secant ogive design — one of the most ballistically efficient profiles ever developed. The raised ring inside the jacket is embedded in the bullet, combined with the one-piece core, keeps the core and jacket locked together during expansion to retain mass and energy.

  • Common Reference – 338 Caliber
  • Bullet Diameter – .338" (8.6mm)
  • Bullet Weight – 225 gr.
  • B/C (G1) – .397
  • Max Case Length – 2.57“

VELOCITY DATA (FPS)

Bullet WeightMuzzle100 yds200 yds300 yds400 yds500 yds
225 gr.280025722356215019551771

ENERGY DATA (FT LBS)

Bullet WeightMuzzle100 yds200 yds300 yds400 yds500 yds
225 gr.391733062773231019091567

BULLET TRAJECTORY (INCHES)

Bullet Weight100 yds200 yds300 yds400 yds500 yds
225 gr.1.9“-8.2“-23.9“-48.7“

Nosler® AccuBond®

The AccuBond is a boat tail design with a lead-alloy core and copper-alloy jacket. The AccuBond bullet represents the most advanced bonded core bullet technology to date. Through a proprietary bonding process that eliminates voids in the bullet core, AccuBond marries Nosler’s traditional copper-alloy jacket with its special lead-alloy core. The result is a bullet that flies true, penetrates deep, won’t cause extensive barrel fouling and retains 60-70% of its weight. Nosler’s Solid Base® at the rear of the bullet acts as a platform for large diameter mushrooms. The polymer tip helps protect against deformation while helping to initiate expansion upon impact.

  • Common Reference – 338 Caliber
  • Bullet Diameter – .338" (8.6mm)
  • Bullet Weight – 225 gr.
  • B/C (G1) – .55
  • Max Case Length – 2.57“

Nosler® AccuBond®

The AccuBond is a boat tail design with a lead-alloy core and copper-alloy jacket. The AccuBond bullet represents the most advanced bonded core bullet technology to date. Through a proprietary bonding process that eliminates voids in the bullet core, AccuBond marries Nosler’s traditional copper-alloy jacket with its special lead-alloy core. The result is a bullet that flies true, penetrates deep, won’t cause extensive barrel fouling and retains 60-70% of its weight. Nosler’s Solid Base® at the rear of the bullet acts as a platform for large diameter mushrooms. The polymer tip helps protect against deformation while helping to initiate expansion upon impact.

  • Common Reference – 338 Caliber
  • Bullet Diameter – .338" (8.6mm)
  • Bullet Weight – 225 gr.
  • B/C (G1) – .55
  • Max Case Length – 2.57“

VELOCITY DATA (FPS)

Bullet WeightMuzzle100 yds200 yds300 yds400 yds500 yds
225 gr.282526592499234421952051

ENERGY DATA (FT LBS)

Bullet WeightMuzzle100 yds200 yds300 yds400 yds500 yds
225 gr.398735313119274524062101

BULLET TRAJECTORY (INCHES)

Bullet Weight100 yds200 yds300 yds400 yds500 yds
225 gr.1.7“-7.3“-20.9“-41.8“
Barnes® TTSX™Hornady® InterLock®Nosler® AccuBond®Barnes® TTSX™
Bullet Weight (grains)185225225225
B/C (G1).432.397.55.514
Velocity (Ft/Sec)
Muzzle3100280028252800
@100 yds2876257226592623
@200 yds2663235624992453
@300 yds2460215023442290
@400 yds2266195521952132
@500 yds2080177120511981
Energy (FT LB)
Muzzle3947391739873917
@100 yds3397330635313438
@200 yds2913277331193007
@300 yds2486231027452620
@400 yds2109190924062272
@500 yds1778156721011961
Trajectory (Inches)
@100 yds1.4“1.9“1.7“1.8“
@200 yds
@300 yds-6.2“-8.2“-7.3“-7.6“
@400 yds-18.3“-23.9“-20.9“-21.8“
@500 yds-37.1“-48.7“-41.8“-43.6“

338 WBY RPM

Introduced in 2022 the 338 WBY RPM (rebated precision magnum) maximizes the magnum potential of the lightweight Mark V 6 Lug action. The goal was to fit a large caliber bullet into a lightweight backcountry rifle that could take down all of North America’s big game.

TRAJECTORY

VELOCITY/ENERGY

338 WBY RPM

Introduced in 2022 the 338 WBY RPM (rebated precision magnum) maximizes the magnum potential of the lightweight Mark V 6 Lug action. The goal was to fit a large caliber bullet into a lightweight backcountry rifle that could take down all of North America’s big game.

TRAJECTORY

VELOCITY/ENERGY

Shop Weatherby Unprimed Brass

Additional information

Weight48 oz
Dimensions8 × 8 × 5 in
Bullet Options

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2 reviews for 338 WBY RPM

  1. Mark “The Shark” Carrier

    My Backcountry TI is awesome. It loves the 185gr Barnes and I’m happy with that. Lille is right at 6lbs with Swarovski Z5 scope. Talley rings and bases. Gun has great balance and is a pleasure shooting it with brake. I got 24” barrel and I’m not sorry I did. More velocity and harder impact. I would recommend!

  2. Justin Berry (verified owner)

    I own the backcountry 2.0 with the 18” steel barrel. I love this rifle, it is now my go to rifle.
    The 338 is super efficient and with the break and amazing stock it has the recoil of a 30-06.
    My rifle loves the 185gr Barnes ttsx

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