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The 5,6x39mm cartridge was developed in the USSR as a hunting/competition cartridge, by necking down the standard Soviet 7,62x39 cartridge. Also adopted for use in Finland and imported by SAKO as the 220 Russian.
the 5,6x39 or 220 Russian fires a 54gr SP bullet @ 2993 fps. Russian loadings fire a 43 gr bullet @ 3379 fps.
it is also the parent cartridge for the 22 PPC, 6mm PPC and 6,5 Grendel
cartridges in photo: 5,45x39, 5,6x39, 7,62x39Attachment 138258
Looks efficient.
In a similar vein: Back in the 1986 Edition of The Gun Digest they published the results of the .30 Apache, a .223 Remington case necked up to .30 caliber. Designed by Joe Apache the wildcat cartridge achieved some measure of success as a metallic silhouette cartridge. It is loaded with either a 168-grain match bullet at a muzzle velocity of 2190 fps or the 190-grain Hornady match bullet at 2100 fps. A 150-grain bullet was also loaded and developed 2250 fps. Although intended as a silhouette cartridge, the performance with the 190-grain bullet closely approximates the ballistics of the old .303 Savage, which was, in its day, considered a good deer and black bear cartridge for hunting in the bush or woods. A 150-grain bullet at 2250 fps just about duplicates the .30-30 Winchester.