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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 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 ).
Handloaders and wildcatters can easily form .260 cases by necking down the 7mm-08 Remington or necking up the .243 Winchester (both based on the same .308 case). [3] Since the parent cartridges were readily available for low cost, the 6.5-08 was often an economical alternative to cartridges such as the 6.5×55mm.
The case head and rim dimensions exactly match the military 7.62x51 (also .308), however, the case body is slightly wider and has more taper. 400 AR : Wildcat. The parent is the 7.35×51mm Carcano rifle case. It has a rim diameter of 0.447", which allows the use of the 7.62×39mm bolt face of an AR-15.
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 .284 Winchester has 4.29 ml (66 grains H 2 O) of cartridge case capacity. The case has a rebated rim and a body almost as large in diameter as that of typical belted magnum cases. .284 Winchester maximum C.I.P. cartridge dimensions All sizes in millimeters (mm). [3] Americans would define the shoulder angle at alpha/2 = 35 degrees.