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Overbore cartridges are those with a relatively large case volume or case capacity, coupled with a relatively small diameter bullet.. The case volume or case capacity and barrel bore area can be mathematically related to obtain a case volume to bore area ratio in metric or imperial units.
A guide to the recoil from the cartridge, and an indicator of bullet penetration potential. The .30-06 Springfield (at 2.064 lbf-s) is considered the upper limit for tolerable recoil for inexperienced rifle shooters. [2] Chg: Propellant charge, in grains; Dia: Bullet diameter, in inches; BC: Ballistic coefficient, G1 model; L: Case length (mm)
The case is fire formed in a 6mm PPC rifle, expanding the case powder capacity. The fire formed case is cleaned to remove lubricant and powder residue. The neck is then expanded to 6 mm and the case length is trimmed to 1.486 inches (37.7 mm), after which the neck is chamfered internally and externally. The case is once again lubricated and ...
The .375 SOCOM is a fairly new cartridge, designed by Tromix in 2013. Taking a .458 SOCOM cartridge case and sizing the neck down to .375 caliber, resulted in a hard hitting AR-15 compatible cartridge, that has a considerable velocity and range advantage over the .458 SOCOM as well as other big bore AR-15 cartridges.
The large capacity of the .500 Express case is due to the cartridge originally being designed to use black powder as a propellant. The 3.00 in (76 mm) case has a case capacity of 138 grains of H 2 O (8.96cm 3 ) while the 3.25 in (83 mm) case has a capacity of 158 grains of H 2 O (10.30cm 3 ).
It is claimed that the .22 Nosler delivers 25% more case capacity and is nearly 90 m/s (300 ft/s) faster than a .223 Remington/ 5.56 NATO. The .22 Nosler is designed to use the existing bolt face of an AR-15, and conversions to this caliber can be accomplished with a simple barrel swap.
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The .450 Watts Magnum is similar to the .458 Lott with the exception of case length which is 2.850-inch (72.4 mm). [1] While the case capacity is slightly more than that of the Lott cartridge, the maximum overall cartridge length is the same. As this is the case, once the bullet is seated case powder capacity is almost identical.