kev one of those i remember now my uncle said was a magnum round so yea at least one is HV he told me he was stacking rounds with the short stubby one, which i dont think is in the picture but its FUCKIN enourmous shell casing but not tall just real squat, he said that one was stackin em in the size of a nickel at 600 yards. Thats pretty impressive, full floating barrels on both those uppers too. Ill call him here in a few days see if i can get specs on those calibers. You can be pretty sure they are hand loadable though and you can reuse the brass because he HATES using store bought ammo, loves to hand load his shit.