The 375 RAPTOR was designed with multiple performance objectives:

  1. Performance will be achieved using a maximum cartridge length of 2.800” to allow magazine length loading in short action rifles designed to support the 308 Winchester and similar cartridges.
  2. Performance will be achieved using currently available hunting bullets from mainstream bullet manufacturers – Speer, Nosler, Sierra, Hornady and Barnes.   Performance from match bullets, not designed for hunting, will not be considered.
  3. The cartridge will achieve an Effective Range to a minimum of 300 yards with multiple hunting bullets. The Effective Range being defined as bullets having an On Target Velocity at 300 yards greater than 1800 fps –  the minimum bullet manufacturer recommended velocity requirement to insure reliable expansion.
  4. The cartridge will achieve a Maximum Point Blank Range greater than 200 yards with a 6-inch diameter vital zone.  The Maximum Point Blank Range with a 6-inch diameter vital zone defined as:
    1. Maintain a trajectory with the bullet flight path being no higher than 3 inches and no lower than 3 inches from the point of aim.
    2. Wind drift due to a 3 mph 90 degree angle crosswind must not exceed 3 inches from the point of aim.  It is generally considered that it takes a 4 mph wind for there to be any visual or physical indication of wind.


Since the release of the 375 RAPTOR, we have found these bullets to be the optimal based on continual testing and in field hunting performance of numerous game animals.

  • Speer 235 grain @ 2400-2600 fps
  • Barnes 250 grain TTSX  @ 2250-2450 fps
  • Sierra 250 grain Game King @ 2250 – 2550 fps
  • Nosler 260 grain Accubond @ 2250 fps – 2525 fps
  • Nosler 260 grain Solid @ 2200 – 2400 fps
  • Speer 270 grain BTSP @ 2200 – 2400 fps

This performance has been obtained across a full spectrum of platforms including

  • AR10 / LR308 based rifles with 12 to 22 inch barrels
  • Bolt action rifles with 18 to 22 inch barrels
  • Lever action rifles with 18 to 20 inch barrels


Muzzle Velocity and Muzzle Energy are only two indicators of performance.  In speaking with engineers at Nosler, Sierra and Speer, there is concurrence that rifle hunting bullets require a minimum on target velocity of 1800 fps to insure reliable expansion.  Using an expansion factor of 1.5 times caliber,  the .375 caliber achieves an expansion of .5625 inches which is exactly 9/16 inch for those that prefer fractional measurements.

Historically, if we look at cartridges that have stood the test of time as great hunting cartridges,  we see a common performance characteristic of bullets fired from these cartridges impacting the game at a terminal velocity of between 1800 and 2400 fps which allows the bullet to reliably expand without over penetrating so  the full kinetic energy of the bullet is transferred to the game animal.

Actual in field hunting performance has proven the 375 RAPTOR’s ability to deliver 200 to 300 grain bullets on target at this ideal velocity window.

Entry wound on Alaskan moose from 375 RAPTOR using 260 Nosler Accubond.  The bullet exited the other side.



We have tested both a 10.75-inch barrel and a 12 inch barrel.  Here are some results:

  • 350-Grain Sierra Match King 1725 fps using AA 1680 – 10.75″ barrel
  • 175-Grain LeHigh Controlled Facture @ 2525 fps using AA 1680 – 10.75″ barrel
  • 260-Grain Nosler Accubond @ 2270 fps using Alliant 1200R – 12″ barrel


Having testing barrel lengths from 10.75″ to 22″, we have the following conclusions:

  • Changing barrel length from 10.75 to 18 inches, the velocity shift will typically be 20-30 fps per inch.
  • On barrels longer than 18 inches, the velocity shift averages 12.5 fps per inch of barrel up to 22 inches.

For the majority of users, an 18 inch barrel is optimal.  However, if you see that you will need to take hunting shots at 250 to 400 yards, then a 22 inch barrel could be ideal.


Wesley Hitt of Omega Rifles demonstrating their Tac Lite Bolt Action with the new Bowers titanium baffle suppressor shooting the 375 RAPTOR with a Barnes 250 Tipped TSX Boat Tail loaded supersonic.   The Omega Tac Lite is a precision bolt action that can change barrels in minutes with the 308 Winchester, 6.5 Creedmoor and 375 RAPTOR as standard cartridge offerings.  In addition, Omega Rifles is offering loaded 375 RAPTOR ammo and their new LR308 complete rifle and uppers.


The follow document compares the 375 RAPTOR to multiple other Big Bore cartridges available in modern sporting rifles.  Calculations were performed using using published data.

Big Bore SemiAuto Comparison

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