RG-037 or 7.62x28mm Cartridge: Soviet Version of the .300 Blackout Concept
By Hrachya H
RG-037 (a.k.a 7.62x28mm) was an experimental Soviet cartridge developed in 1983. Its parent cartridge is the 5.45x39mm. The RG-037 has similar dimensional relation to 5.45x39mm as the .300 Blackout has to .223 Remington. If you apply the .300 Blackout case forming method to the 5.45x39mm cartridge, then you’ll end up with something similar to the 7.62x28mm. […]
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Source:: The Firearm Blog