And length has a lot of influence on twist required. The reason for this is that copper and yellow-metal bullets are less dense than lead-core bullets and so with bullets of an equal weight the monolithic bullets are longer. With some monolithic and plastic-tipped bullets the above twists may be too slow. This chart is based on jacketed lead-core bullets. For more information about choosing the correct twist rate Click Here. You may contact Carson with questions by e-mail CLICK HERE.īULLET WEIGHT / CALIBER / TWIST RATE CHART
One must observe all possible safety precautions and practices in accordance with proper handling of any explosive. We are also very willing to help you determine the correct twist. Load Data WARNING: The task of reloading center fire metallic cartridges should only be undertaken by someone familiar with reloading procedures. The rate should be based on the heaviest bullet you intend to use. Caliberįor help in selecting the correct twist rate for the bullet you plan to use please refer to the chart below. Maximum finish length is 44″ unless indicated otherwise. Only the following caliber/twist combinations can be ordered over 30″ in length. Most caliber/twist combinations can be ordered in a finish length up to 30″ at an additional charge.
Our standard length barrels are furnished as a 28″ long blank that will finish up to 27″. Some twists are available in more than one groove configuration as indicated. 300 Whisper ® load.Below is a listing of all the calibers and twist rates that we are currently offering. By loading the 300-grain Sierra HPBT MatchKing bullet at subsonic velocities (1,040 ft/sec.) for suppressed applications, the muzzle energy measures 720 ft-lbs., surpassing both the high velocity 115-grain load for the 9mm Parabellum as well as the 240-grain. 338 Spectre will launch the 180-grain BT at 1,800 ft./sec., approaching 1,300 ft-lbs.
35 Remington or even the 180-grain load for the. Furthermore, it allows the user to employ existing suppressors for the 9mm without modification, providing enhanced tactical firepower.īallistic performance is comparable to the. 338 caliber bullets, the cartridge offers a variety in projectile choice, ranging from 160-grain Barnes X Spitzers, through 180-grain BST to 300-grain HPBT MatchKing rifle bullets. 338 Spectre offers great potential as a single shot, silhouette and small game cartridge. Build a custom barrel with Match Grade Machine Encore Contender Pre-Fits Build A Custom Barrel Base Price: 420 Our current lead time is approximately 10 12 weeks + additional time for shipping. It shares rim size with the Remington 6.8 x 43mm SPC cartridge, allowing use of OEM bolts in this caliber. The cartridge is intended to fill the gap between traditional pistol caliber cartridges and existing rifle cartridges used in this weapon system. 338 Spectre cartridge was developed specifically for the AR-15 family of gas-operated, detachable-box magazine-fed firearms.
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