.416 Remington Magnum (using Hornady bullets)
Date: Mar 25 2016
The .416 caliber, based on a large proprietary beltless case, was offered in 1911 by famous British make (John) Rigby. It earned an outstanding reputation on heavy African game including lion, buffalo, elephant and other potentially dangerous animals. Although it was offered in a few double rifles and single shots, it was primarily designed for bolt-action rifles. Due to its large case size, however, it required a large ring action, or Magnum Mauser type action, which prevented many domestic bolt rifle manufacturers from offering it.
Wildcatters naturally began experimenting with smaller cartridge cases necked to .416 that could be housed in traditional bolt actions, including the .416 Taylor and .416 Hoffman. These cartridges influenced Remington to introduce the .416 Remington Magnum in 1988. It was based on the 8mm Remington Magnum case necked to accept .416-inch bullets, and can be housed in any action suitable for the .300 H&H or .375 H&H Magnums.
In creating the .416 Remington Magnum, 416 Rigby ballistics were closely duplicated by pushing a 400-grain bullet to an advertised 2,400 fps; however, maximum average pressures are approximately 13,000 psi higher, at 54,000 CUP, whereas the .416 Rigby operates at 52,000 PSI. In a Ruger No. 1 test rifle, Remington factory loads (400-grain Swift A-Frame bullet) clocked 2,342 fps.
There were no real difficulties in handloading the .416 Remington Magnum; however, Hornady bullets were seated to an overall cartridge length of 3.600 inch, rather than the 3.520 inch listed in the 9th EDITION HORNADY HANDBOOK OF CARTRIDGE RELOADING. Although not necessary for ammunition loaded in our Ruger No. 1, bullets were roll crimped in place (as recommended when handloading for bolt-action rifles to help keep bullets in place when subjected to heavy recoil).
Several powders gave notable accuracy and velocity including IMR-4895, IMR-4064, Alliant Reloder 15, Accurate 2495 and Hodgdon H-380. Regardless of powder choice, Large Rifle Magnum primers are recommended.