6.5 WBY RPM (Rebated Precision Magnum)

Weatherby has traditionally designed and built ultra-high velocity cartridges with unique case designs-belted magnums with a double-radius shoulder. This is seen in all of the existing Weatherby cartridges until now. The Mark V 6 lug standard action has been one of our best-kept secrets for years. The goal of the 6.5 WBY RPM (Rebated Precision Magnum) was initially based on maximizing the potential of this great lightweight action. Setting out to produce the best backcountry rifle and cartridge combination ever, was a project not taken lightly. At our core, Weatherby prides itself in ballistic superiority. The rebated rim helps achieve the desired velocity and energy we were looking for while remaining compatible with our 6 lug action. The 6.5 WBY RPM packs a punch and is capable of being chambered in Weatherby’s new sub-five-pound rifle, the Mark V Backcountry Ti. This combination offers maximum downrange performance in the lightest rifle possible. After years of development, the 6.5 WBY RPM combination achieves weight savings, ballistic performance, and price that cannot be found in a rifle anywhere else.


The 6.5 WBY RPM is based on a lengthened version of the existing 284 Winchester. This cartridge has a rebated rim, making it compatible with standard 30-06 bolt faces and reloading equipment. However, the large body diameter, low body taper, and 35-degree shoulder mean that case capacity is greatly increased, leading to higher velocities. In addition, bullet innovation in the 6.5mm category is highly efficient with less drop and wind deflection than many heavier calibers. All these details culminate into a cartridge that delivers 1,500-foot pounds of energy at 500 yards capable of ethically taking big game animals across the globe.



BARNES 127 GR - 3225FPS
ACCUBOND 140 - 3075FPS
6.5 PRC - ELD-X 143 - 2960FPS
264 WIN MAG - ACCUBOND 140 GR - 2929FPS
6.5 -284 NORMA - ACCUBOND 140 GR - 2750FPS
6.5 CREEDMOOR - ELD-X 143 - 2700FPS
260 REM - ACCUBOND 140 GR - 2655FPS
YouTube video


Why create another 6.5mm cartridge after all the recent new offerings?

We wanted to create a round that would fit in our standard 6 Lug Mark V rifle action, yet would take advantage of the full cartridge length that action is capable of chambering. Basically, to have the most horsepower possible in the smallest package.

What kind of velocity and energy can I expect from 6.5 Wby RPM?

Typical velocity will be 3000-3100 fps for a 140gr bullet and 3200-3250 fps for a 127-129gr. Muzzle energy nearing 3000-foot pounds.

What bullets are offered?

127 Barnes LRX, a 130 Swift Scirocco, a 140 Nosler Accubond, and a 140 Hornady Interlock.

Does this cartridge have the typical long Weatherby freebore?

No. This cartridge is a departure from the traditional Weatherby design and has a freebore length similar to other modern cartridges.

Can I make 6.5 RPM cases out of another caliber’s spent brass?

No. Although this cartridge shares the case head and base dimensions of the 284 Winchester, it is much longer than the parent case and is therefore not able to be formed out of existing cases.

What will the barrel specs be for this cartridge?

Similar specs to our WBY 6.5-300: 4 grooves with a 1 in 8” twist.

Who produces reloading dies?

Hornady – Item Number 546287

Redding Reloading – Item Number 80794 & 84794

RCBS Reloading – Item Number 22501

Are there any reloading articles written about the WBY RPM?

6.5 WBY RPM Load Data – Courtesy Wolfe Publishing